E34 offset questions

[TuningLA]

I have a 1992 525i E34 and I'm currently running 18x8.5 F & 18x9.5 R ET 15 all around. Now I am looking to go with a step lip 18" wheel but first I would like to go to a 9" F and 10" R not sure if I can and if so what do I need to do? Then I'm curious on what offsets are others with a E34 are running I want that super aggressive look all around. Any help would be greatly appreciated. Thanks ahead of time

Oh one last thing I'm lowered with Bavarian Autosport Springs and Bilstein Sport Spring. I'm having a hard time finding a coil over set for my vehicle any good places to look would be appreciated as well. Thanks again

[Stupid Kid]

Aren't don't you have to weld for most sets of coilovers for e34's ?

That maybe why they aren't as common as possible.
I think jom bluelines and fk's dont need welding for these cars, not that id recommend them unless you're on a budget.


As for offsets, get ruler and use http://www.willtheyfit.com/ to handle the maths.
just compare to your existing set for reference.