Hey guys, I have no idea when/how this came off and then how it got lost, but I am missing the nut and special washer (star pattern?) that holds in the seat belt. This is the part where the buckle goes into the fastner with the release button. If you look down, that unit has a metal end with a hole that slips over the bolt that comes out of the seat.

I could certainly put on another nut to hold it in, but I don't want there to be loose play with it that destroys the threads over time. Lexus says I have to buy a new unit to get this nut/washer combo. Does anyone know another lexus part that is identical, where I can get this part used, or some alternative?