Hi
I'm trying to do something similar to my 3 bolt strut style 1303. I've not been able to get front drums at different stud patterns and have been told it wouldn't work anyway (offset i think?), so i've now bought a second hand disc conversion. I also have discs and rear drums drilled for 4x100. thought this was all i need but have now found out I need slimline strutts like topline maxx or kerscher ones to use a 7or 7.5x17"
So after reading hundreds of posts and phone calls if this is all used and wheels are of offset 50mm or there about you should be able to run 17" under standard fenders.
Sorry i don't know about your ET38 offset, maybe its just a spacer job? I'm sure if i'm wrong someone will help out. (maybe i'm way off
)
www.Machine7.co.uk can do discs/drums at 5x100 or anything else you would like.