Found Beseler (or Delta) 4x4 adjustable lens board 39mm diameter

I'd like to get one or two of these for use on my Beseler 45 enlarger. I believe Delta also made them. The one in the picture has a 53mm mounting hole, but you get the idea. If there are currently any on ebay then my ebay-fu is inadequate, the only one I can find has a 52mm hole.

I'm in the US so a US seller would make the most sense.

I think I might have a spare one, I'll check in the morning.

I have two that I’m not using.