Ok I've got an S5 GTU which came with the crummier single piston front brakes and non vented rears. I have rebuilt 4 piston fronts which are pretty much a direct swap and I want to get a set of stainless brake lines. The lines are sold in sets of 4 from places that I've seen. Either 4piston/vented or 1piston/solid set.

Will the set of 4 SS lines for a 4piston/vented setup work on my car when I have 4pistons fronts but non-vented rears? I don't know where I'd find the specs on the rear brake lines. What are the differences?

 

Get them for the 4 piston front, single rear. They are the same for vented/ non-vented.