does anybody know if this will work or if i need to run a spacer, what size spacer?

thanks

front or rear?

the skinnies use a spacer up front along with longer wheel studs, rears you might get away with grinding the caliper fins off, I know on LT1 and LS1 brakes that is how they fit them.

the rears are stock discs and i already know they fit. im worried about the front cause of the new 12in rotors and dual piston calipers. the skinnies fit over the stock discs without a spacer

They will fit.

yeah they should fit fine. you got 1.75inch backspacing? if it doesnt fit you can try to run a spacer...1/4 to 5/16 inch shoudl be fine. longer wheels studs help too tho.

i have ls1 rear end with teh 12inch ls1 4th gen brakes, and just for fun, i tried to fit the 15x4 skinnies on the rear and it worked and cleared fine. you should be good with the 1LE's

cool thanks guys