Fuel Line Nut Kit

I have a 1994 GMC Sonoma, 4.3L VIN W. I'm going to be replacing the fuel pressure regulator next week (looked into the plenum via IMTV hole and see that it's been leaking). At the same time, I may replace the feed/return nut kit. I can't find one anywhere. Does anybody know where it can be purchased?

http://robstark.com/cpi.htm

or

http://www.lindertech.com/reconinj.htm

or a local gm dealer...