Go for slingshot cycles he is a good guy and the lines are top notch
The price difference between original and the stainless is little and the extra confidence and slight improvement is worth it. Depending on who is trying to rob you his stainless lines may be cheaper
I will admit I reused my stock steel line but think about it like this. Brake lines rust from the inside, not just the outside. It would be bad if that line finally gave up on your panic stop and now you couldn't stop. Hit up auto zone with your brake line and compare it to the pre made lines they have, you will find a match. if you don't have line wrenches cut the line at the fitting and use a socket to take the sucker out, so much easier than trashing the fitting