Hi bought a set of rs7 softlines et38 will they fit my mk1 sierra with cosworth front bed and brakes with 205-40-17 tyres

 

Im pretty sure the standard offset for the 15's is et38 so yes. Are TS7's 7 inch. You should be fine.

Ive got 7.5 (et30) front and 8's (et25) rear. You could probably go much lower offset unless you want to keep the standard sucked under look.

 

i thought they needed a spacer for the brakes to clear.

 

only need a spacer if using 2wd brakes and 2wd four pots - if using 4x4 cossie brakes then the wheels will go straight on