71 198 slant 3 on tree

I have been out in the shop, trying to organize parts, and guess what I found? A 1bbl to 2bbl adapter. It is similar to the ones linked to, but the holes are not slotted.
It has a part number of 5710 on it. I think it is Offie. FLATHEAD HOT RAT ROD TRI-POWER CARB ADAPTER-4 BOLT TO 2 BOLT CA-16 OFFY 5710 | eBay
It will take a slant six 1 bbl holley carb. I don't have a 2bbl carb handy to check that. It is 1.5 inches tall. If your interested PM me.
PS: It is used.