Ping!
Cool thread, cool truck.
I have been messing with oem caps on Wheel vintiques wheels forever trying to get it right. I am pretty happy with the process now.
You have to cut the insides out of an oem cap and remove, then cut the dome part out of a WV baby moon cap. Then it is a matter of tig welding, or I suppose riveting the two together. I took a ton of pictures and can't find them now so I will try to add more. The welds end up in the black painted part of the wheel so it is just a matter of repainting them.
I don't have very good pictures at the moment and it doesn't seem to matter because I can't get them to attach either on my phone or desktop!
I will try again later.