Try J&P Cycle, eBay, or google vance & hines. Not exactly sure what you're asking; where to find pipes or what style pipes. Personally I like the blacked out big radius on a night train.
Pick a pipe, personally id go either longshots or 2 into 1. Get the part number and look at mandmcycles.com or realhog.com they offer great prices on stuff. Hope it helps.
Thank for the tip guys i think the blacked out look would be better for my night train.There is a part that harley has stopped making and i know somebody knows where i can get one it is a blacked finned chain inspection cover part # 60618-01.It would inprove the look of my 05 night train,thanks.