If you're a function over looks kind of person, I'd say don't bother changing the rails at all. Your stock fuel lines will run out of steam before the rails do.
The fittings used are based on how you want the rails setup, and your budget.
You can use push-lok fittings which are ugly (IMO) but certainly effective. You can run dual feeds or a single feed. You can run braided stainless or braided nylon (Pro-lite) line. You can attach the regulator to the end of the rail, or remotely. There are a lot of options here.
I run an adapter fitting from the stock hard line to a -8 single feed to the passenger side rail, then crossover to driver side, then attach regulator at the back of the driver side rail, then return line back to an adapter fitting on the OEM return hard line.
I got my latest set of Aeromotive rails on the Corral used for $75 with fittings. I sold some of the fittings for $16, had my friend mill the tops of the rails to clean them up, then had them anodized black along with my FPR.
This is what they look like now:
Keep in mind, although I got stuff used and have a great hookup on fittings, this whole deal still cost me several hundred bucks. Be aware of that before you get started.
Paul.