Don't rule out a lower right leading wishbone!
You can try SJ Sportcars, but don't raise your hopes. I ordered one from them and a couple of months later they cancelled my order. Apparently they were waiting for Arch Motors to make one for them, and Arch Motors had better things to do.
Some (or all?) type 65s got the same lower wishbone as the type 74. There's a clue to that in the Lotus part number - A065C0043Z .