I'd bet they fit. the thread should be a 3/16-tube inverted flare. It looks like a little cone sticking up deep inside the fitting? A 3/8-24 bolt will thread in?
anyways, rangers have a super common size, i'm sure the mustang is the same.
I got my front lines from a local shop. Call the 4wd shops and ask if they sell universal SS lines. Otherwise, summit sells universal lines that bolt on...just make sure they ahve the DOT (i've heard if you don't have this and you drive on teh street, you can get in big trouble...don't know how true it is though...)
2001 XL 2wd, 2.5L powerhouse Hurst equipped
building a 2.3l turbo monster engine
8.8 l/s, 4/4 djm drop
17inch cobra rims, 13inch cobra front brakes, 12inch cobra rear brakes