Capture plate?

OP, if you live in the So Cal area I have a couple of different capture plates to choose from that I'd be willing to give you. One is a universal mount type that attaches to the pinbox with allen set screws (which I replaced with stainless steel to avoid rust). The other requires that you drill holes in your pinbox and connects with small nuts/bolts. It was fitted to an older Fleetwood Terry 5th wheel trailer. I would need some dimensions of your pinbox's kingpin plate to determine if either is a fit.