need a rubber return fuel line for 1995 Buick Riviera supercharged.

Hope your not talking about the 3 lines that run along the firewall with little pressure fittings I can't find a part number on them and, one is leaking!

You might try Oreillys auto parts.They may not carry factory replacement, but some of the stores make high pressure hoses.

I have replaced many of my high pressure fuel lines with standard fuel line hose and fuel clamps. Simply find tight fitting fuel line, slide it over the GM fuel line and carefully tighten the clamps. do not use standard hose clamps. they do not compress correctly and you will have leaks. Sometimes it takes two clamps to hold firmly.