Looking for a Seat Belt Sleeve Lock...

I'm looking for one more of these. (see picture) not the sleeve, but the piece that fits over the end of the sleeve under the seat (the one with the arrows pointing to it). Color is not an issue. These things are hard to find. If you have one you would like to sell, P.M. me with your details. The dimensions are aprox. 3-13/16" long, 2" across the bottom (edge to edge) with the slot being 3/4" wide by 2-7/8" long.
This one actually came off of a high back bench seat for a 74 Dart. I would kinda guess these would interchange with other seats...
Thanks
19 Again..