Mounting Graham B44 arm on SME 20/2

I acquired a Graham Phantom II B44 tonearm having a standard (circular) mounting base with the intention to mount it on a SME 20/2 platform. The previous owner had the arm mounted on a SME 30, using a custom base adapter (sub-base). This circular custom base replaces the base on the SME plinth that provides the slotted hole for SME tonearms, and provides a center hole plus additional mounting holes for the standard Graham tonearm base.

Sadly, this custom sub-base adapter was shipped via FEDEX separately from the arm, and was lost by FEDEX!

So far, all my searches have not given any fruit in locating such a custom adapter. I am still pursuing it but I am posting here in case the group can offer any helpful ideas in sourcing such an item.

I have read that the B44 can be used with a variety of turntables using custom mounting bases. So far, I have no idea who sells such bases. To avoid confusion, there is a version of the Phantom II/III that comes with a mount to fit the slotted SME base. That's not the version I have.

Also, after contacting SME directly, they don't provide any other bases.

Thanks