Tube guru's - 7 pin tube socket / 11/16" pin circle with center pin?

[treitz3]

Can anybody suggest a place that carries 7 pin tube sockets that have an 11/16th pin circle? Maybe one that has a center grounding pin?

If you do not know off the top of your head, could you be so kind as to point me in the right direction?

Thanks in advance and thanks for looking. Much appreciated.

Tom