Use the online link. If he cannot find the part online call Trinity for the part number and do a search, it will come up. I do not reccomend buying straight from Trinity over the phone becuase in my experiences with them they will charge you Full list price and then promise to correct it and never do.
What does your friend need? I have a good quantity of parts left over from mine that I can't use and haven't bothered to list on E-bay yet. If your friend is interested I can put together a list of what exactly what I have. Generally speaking I have most of the suspension parts, alot of arms, drive shaft, stock motor, ect. I'll give him a good deal if he wants the stuff.