How many variations are there of the 15" steel SAAB 9000 rims??

So far I think there's

15x6" ET39
15x6" ET33 (the ones to get!!)
15x5.5" ET33

If they're not 15x6 ET33 then there's gonna be clearance problems up front right??

Rather than starting a new thread I thought I would post here.

I just picked up some Alloy Saab (Sunraysia) rims and they have an offset of ET40.

I currently have 2 saab steel rims with ET39 on the car as back wheels that fit fine.

Does anyone know if I'll have issues on fitting the ET40 ones to the front or back?