Got two kinds of hub caps. Pretty sure the round ones are for the 39 pu. The others, flatter with a ridge around outer most edge
Also,found a 46 Merc hub cap if someone needs one.
One on the left is 39 pickup , center should be Stainless, looks like it was painted with a brush ,HA. I have seen them for sale around the net for fair prices , I think some vendors have new one's as well .