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[johnnydog]

The two strut to hub / knuckle bolts / nuts I believe you are referring to are shown as no.18 and 19 on this link....
https://vauxhall.7zap.com/en/car/v94/k/0/6-6/
I think they are all the same regardless of model.

[Doctor Gollum]

Put simply, you need to read the whole table...

The ones Johhny linked to are superceeded

Also the first two are probably alternaives, but you cannot expand the information or applicability tabs, so you'll be guessing all day...

They're for armoured/hearse...

Like I said elsewhere, it helps to use an IPC that works...

http://www.catcar.info/opel/?l=bWFya2E9PVZYfHxzdD09NDB8fG1vZGVsdHlwZT09Vjk0fHxtY29kZT09VlhNfHxsYW5nPT1HQnx8c3RzPT17IjEwIjoiXHUwNDFjXHUwNDNlXHUwNDM0XHUwNDM1XHUwNDNiXHUwNDRjIiwiMjAiOiJWYXV4aGFsbCAgT01FR0EtQiAoIDE5OTQgLSAgMjAwMykiLCI0MCI6IksgRlJPTlQgQVhMRSBBTkQgU1VTUEVOU0lPTiJ9fHxzY29kZT09S3x8c3Njb2RlPT18fG1uY29kZT09NXx8c21uY29kZT09N3x8aWtleT09Mg%3D%3D

[johnnydog]

The bolt 90496191 I quoted has superseded 90236579; the nut 90538057 has superseded 90496111...

[johnnydog]

Put simply, you need to read the whole table...

The ones Johhny linked to are superceeded

Also the first two are probably alternaives, but you cannot expand the information or applicability tabs, so you'll be guessing all day...

They're for armoured/hearse...

Like I said elsewhere, it helps to use an IPC that works...

http://www.catcar.info/opel/?l=bWFya2E9PVZYfHxzdD09NDB8fG1vZGVsdHlwZT09Vjk0fHxtY29kZT09VlhNfHxsYW5nPT1HQnx8c3RzPT17IjEwIjoiXHUwNDFjXHUwNDNlXHUwNDM0XHUwNDM1XHUwNDNiXHUwNDRjIiwiMjAiOiJWYXV4aGFsbCAgT01FR0EtQiAoIDE5OTQgLSAgMjAwMykiLCI0MCI6IksgRlJPTlQgQVhMRSBBTkQgU1VTUEVOU0lPTiJ9fHxzY29kZT09S3x8c3Njb2RlPT18fG1uY29kZT09NXx8c21uY29kZT09N3x8aWtleT09Mg%3D%3D

Where did you glean this little gem from? This bolt is listed for all Omegas, with the 90496161 part number I have previously given which superceeded 90236579, plus also is fitted to some Astra G, H, Meriva and Zafira models  -  where's the info relating to armoured / hearse models?? ....
Anyway, I can't believe I'm arguing the toss about a friggin' bolt, when the current info is there to see, whether looking at 7zap or Catcar or any other EPC.....
Addy only asked for a bit of info..... its a f...ing bolt (!!!) which is still available for purchase if needed....

[Doctor Gollum]

Here...

http://www.catcar.info/opel/?l=bWFya2E9PVZYfHxzdD09NTB8fG1vZGVsdHlwZT09Vjk0fHxtY29kZT09VlhNfHxsYW5nPT1HQnx8c3RzPT17IjEwIjoiXHUwNDFjXHUwNDNlXHUwNDM0XHUwNDM1XHUwNDNiXHUwNDRjIiwiMjAiOiJWYXV4aGFsbCAgT01FR0EtQiAoIDE5OTQgLSAgMjAwMykiLCI0MCI6IksgRlJPTlQgQVhMRSBBTkQgU1VTUEVOU0lPTiIsIjUwIjoiMzguU1RFRVJJTkcgS05VQ0tMRSJ9fHxzY29kZT09S3x8c3Njb2RlPT18fG1uY29kZT09NHx8c21uY29kZT09LTd8fGlrZXk9PTE%3D

It's not about drumming off the first part number you find Cross reference the entire document to confirm stuff...

As for finding a part, that's the easy bit. Having established the correct part number/s, including NLS, simply search using just the part number, whether that's the GM or Vauxhall or Opel number, and find a seller and buy it. Google, ebay.com, ebay.co.uk and ebay.de all prove to be pretty productive to this end.

Anyhoo, there's actually FOUR different nuts and bolts for this job... 1 NLS, 1 (current) correct EXCEPT Ambulance/Armoured/Hearse, 1 Ambulance/Armoured EXC Hearse and 1 Hearse.

For clarity, when I referred to the 'first two' I meant #28 and 29 that Addy referred to, which are obviously for different steering knuckles as the part numbers are different for Ambulance/Armoured and Hearse, so had Addy ordered them, the chances are that they wouldn't physically fit

[johnnydog]

If you check under front shock absorbers on either catalogue, it gives the two strut body to knuckle bolts / nuts as nos 18 / 19 respectively - both the same size M12 x 50 with the parts numbers I gave earlier.
If you check under steering knuckle on either catalogue, it gives the top bolt (no. 29) as part no 11090822, size M14 x 1.75 x 56 which is NLS, and the bottom bolt (no.28) as part no.11096171, size M12 x 1.5 x 55.
In the Catcar EPC, it confuses matters slightly, by describing the top bolt (no. 29) For Hearse, yet underneath with the same part number states Excluding Ambulance / Armoured Body / Hearse.....
So going back to one of Addys original points, the two bolts may well be different sizes both in length and width in his particular Omega.
I therefore would re use the existing bolts if in satisfactory condition, or use them purely to obtain replacements with the same dimensions for the existing ones...it is unlikely that they aren't the originals from new.