I have a set of Bud Elharts (cast inside) on my 312 in my '56 Custom Vicky and a good friend is looking for some. They were made in CA. in '56 or '57 and advertised in Hot Rod Mag. There is a Right & Left (yeah, I know mine are on wrong), but they sure look great and cause a lot of comotion at meets. The rest of the car looks as good as the engine does also.
Last set I saw on the Bay went for about $350, maybe 8-9 months back. I think it's spelled Ehlert, though.
The Jalopy Journal
