You drilled a hole in a kevlar spur gear that wasn't out yet?
The Losi guys stopped drilling out the non-kevlar gears, because it caused them to flex a bit and throw off mesh under hard accelaration, but it works not because the kevlar is much more rigid.
The adaptor might of been plastic, I didn't really look. Remember though, kinwald has TWO cars.....and they are vastly different, just look at the servo on the one he is not running. It has one set of the mounts cutoff and its moved over up against the drive tunnel. He redrilled mounting holes on the outside for it and then shoogooed(I think) to keep in place.
You get the belt, new mount, pulley and remaining hardware for $22.
There is no part number, the packages don't have header cards.
Later EddieO