I went for these LINK some time ago, They've been fine no issues to report 
(That's the price per bulb btw)
Thanks. 
They for the puddle/door lights right? Did you change the roof ones?
I'd need to check to be 100% sure, But I'm sure I replaced the rear reading lights and door lights with the same size festoon, With some minor adjustments bending the metal bracket a little. For some reason the front doors tend to flicker now and again briefly but only on the front not sure why but doesn't bother me ads a spooky look

... (Not 100% sure but I'm pretty sure the boot requires a bigger size festoon)..
But on a serious note I'd definitely recommend these
LINK for the front reading lights, You can actually see what your doing. Not the bulbs that come on as you open the door the ones with the button each side, Tried the ones that come on as you open the door but for some reason there's a constant light till the delay cut out if you change them probably because of the low amount of power they require not being 100% compatible with the Omega.