Looking on Rock Auto for new YJ front brake lines, but the fitment guides says there is a difference between 1987-1989 and 1990-1995 brake lines (different part numbers). Is there any difference, which one should I go with?

Idk about for the front, but you want the 1990-1995 for the rear.

I already got the rear soft line, for a Dakota...

We got 95 YJ lines for the front of my roommate's MJ, they were exactly what we needed.