Just posting this to show someone the difference between the Russell stainless steel rear brake lines and the custom lines I got from DynoSpeed Racing. 
The DynoSpeed lines are the installed ones with the round banjo fitting in the attached photo. The Russell line is the one that has the block-shaped banjo fitting. Also, note the lower-profile banjo bolt the DynoSpeed line came with. You can see where I tried to grind down the stock banjo bolt to get a little more clearance for my 15x10s.
Clearance between my Weld 15x10s with a 1/4" spacer and the DynoSpeed banjo bolt on the Bullitt calipers is about 1mm.
Note that with 15x8 rims or with stock Mustang GT brakes, clearance would not be a problem at all.
My only complaint about the DynoSpeed lines is that they don't have a plastic coating over the stainless line, so they rattled against the bottom of my car. I solved this by splitting a few pieces of fuel line and zip-tieing them over the lines.
The DynoSpeed lines are the installed ones with the round banjo fitting in the attached photo. The Russell line is the one that has the block-shaped banjo fitting. Also, note the lower-profile banjo bolt the DynoSpeed line came with. You can see where I tried to grind down the stock banjo bolt to get a little more clearance for my 15x10s.
Clearance between my Weld 15x10s with a 1/4" spacer and the DynoSpeed banjo bolt on the Bullitt calipers is about 1mm.
Note that with 15x8 rims or with stock Mustang GT brakes, clearance would not be a problem at all.
My only complaint about the DynoSpeed lines is that they don't have a plastic coating over the stainless line, so they rattled against the bottom of my car. I solved this by splitting a few pieces of fuel line and zip-tieing them over the lines.
You're right, I overlooked the word "rear" in the original post. 
