i dont know what the name of it is, but its the piece that the injector sit in. there is a plate that goes on top of it, with 8 screws...i was tightening that plate down, and i guess an injector was not lined up perfectly, and a piece off the bottom broke off, now its just a huge gas leak...i think the broken piece itself bolts on with 3 screws...i'm going to go to the dealer tomorrow, to see if they have any, but will probably find out you have to buy the whole TB assembly. what car was it off, so i can cross reference the pn's and see if it will work? thanks