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[Lizzie Zoom]

Coil over plug would be an accurate assessment.

Plugs on the 2.6/3.2 are a twenty minute job every time.

Also, you're looking in the wrong place for GM parts. But you already know that.

Yes I do, but I now look everywhere for the right brand, the correct part, and at the right price.

[Nick W]

My understanding is a DIS is the term usually used for a wasted spark, and coil/coilpack for non wasted spark?

DIS is Distributorless Ignition System, so it could be either.

[johnnydog]

The coil packs probably need replacing occasionally on these anyway.  If the old one is still servicable (not swelling or clear rust visible where the plastic gets hairline cracks, keep as a spare, and acquire some replacement boots.

Over the years, I have found the biggest killer of the coil packs fitted to the 2.6 / 3.2 is water ingress into the plug wells which accelerates internal corrosion, which can be seen on the metal core at each coil upper end (thick end of the rubber insulator boots), and rusty cracks. Oil in the plug wells will cause the insulator boots to perish at the plug end.
But taking these two causes out of the equation, coil packs should last for an infinite number of years. I have only had to change them on other cars as a result of another issues causing the problem,  ie water leaks from the scuttle or oil from the cam covers.
I have a 2.6 that is still on its original coil packs, and it is now approaching 19 years old and 70k.
Probably jinxed it now....

[VXL V6]

.....

Plugs on the 2.6/3.2 are a twenty minute job every time.

....

I couldn't change them in that time, it would take me most of that to unpick and remove the tray to be honest. No 6 can be a fiddle but once you remember the combination of bits you used last time it's not too bad. 

[Lizzie Zoom]

.....

Plugs on the 2.6/3.2 are a twenty minute job every time.

....

I couldn't change them in that time, it would take me most of that to unpick and remove the tray to be honest. No 6 can be a fiddle but once you remember the combination of bits you used last time it's not too bad. 

I agree with those comments. As I said, Number 6 was again difficult even when trying with various combinations of sockets, extension bars and universal joints.  For some reason it would not loosen up, but eventually it gave up!

I must say that on the Omega V6’s I have always found that plug the most difficult, with a fear I am going to cross thread the new one when I put it in.  I’ve always succeeded in the task though

[Lizzie Zoom]

For when I fit the new DIS pack, is the connector on the old one easy to unclip please?

[YZ250]

.....

Plugs on the 2.6/3.2 are a twenty minute job every time.

....

I couldn't change them in that time, it would take me most of that to unpick and remove the tray to be honest. No 6 can be a fiddle but once you remember the combination of bits you used last time it's not too bad. 

I usually spent the first fifteen minutes faffing about undoing the cable tray and then pulling the cables clear with a bungee. 

[YZ250]

For when I fit the new DIS pack, is the connector on the old one easy to unclip please?

It's just a tab. Flat blade screwdriver under the tab and wiggle it clear. 

[VXL V6]

For when I fit the new DIS pack, is the connector on the old one easy to unclip please?

It's just a tab. Flat blade screwdriver under the tab and wiggle it clear. 

...then wonder where it's gone when you go to plug in the new coil pack.... 

[Doctor Gollum]

For when I fit the new DIS pack, is the connector on the old one easy to unclip please?

No wonder the plug change takes so long if you don't unplug it for that.

10" combination of wobble extensions makes short work of plug 6. The only reason it can be a pig is if it has never been changed by previous laziness.

[Doctor Gollum]

To answer the question re the coil pack plug...

DO NOT bolt it in before you have fitted the plug. This is because the plug naturally falls to a position underneath the coil pack socket and you WILL crush it if you bolt the pack down on top of it. 

[Marks DTM Calib]

Bosch coil packs are still available, there is a good seller on ebay (Powersparks) who I have used quite a bit without issues.

They have them listed for about £77 delivered:

https://www.ebay.co.uk/itm/154596665618?fits=Model%3AOmega&epid=249114263&hash=item23feade912:g:ObQAAOSwmz5hM0O2

and

https://www.ebay.co.uk/itm/185032225768?fits=Model%3AOmega&epid=248933317&hash=item2b14c7b3e8:g:d3wAAOSwZD5hM0O3

[Marks DTM Calib]

As for DIS and Coil pack, the DIS was a module which utilised wasted spark tech to replace a distributor but, still had traditional HT leads.

Then came the 'coil per plug' or 'coil on plug' as it was sometimes called, directly connecting the coil to the plug with no external wires, some manufacturers combined mulitiple coil on plugs into a single 'coil pack'.

[Andy B]

..... 
 Usual trouble in getting to spark plug 6, but after much cursing the idiots who designed so much in the way of this plug that I have wasted hours on over the years, I finally extracted it.  .....

Plugs on an Omega & even No 6 plug on a Senator are dead easy compared to my Smart Roadster. 
Rear panels off first
Then all 6 plugs .... top 3 are easy .... lower 3 not so easy

[Doctor Gollum]

As for DIS and Coil pack, the DIS was a module which utilised wasted spark tech to replace a distributor but, still had traditional HT leads.

Then came the 'coil per plug' or 'coil on plug' as it was sometimes called, directly connecting the coil to the plug with no external wires, some manufacturers combined mulitiple coil on plugs into a single 'coil pack'.

And some use a single coil to drive two plugs per cylinder with two leads. Because they could.