hes not doing a timing belt or timing belt tensioner, he needs a cam chain tensioner. There is one on each bank of the 2.8v6 they are oil fed by the engine for tension and keep the two cams on each bank in time.
Jason, Id look into PAP parts, ECS Tuning, International Parts store, MJM Autohaus and then from there Id check used on vwvortex or some audi forums for someone with a trashed head with bent valves that will part out the head and sell you the tensioner cheap.
Just call byers or mag with your vin and get the part number for the tensioner or look at yours so you can get the correct one if you pick it up used.