If you need a red FLAT CAP for a QA with the VL 566 AV distributor call;
Bob Wyman - System 1 Pro Ignition in (CA) - 559-687-0288. He has quite a selection of ignition parts for Chevy, Ford...etc various displacement older engines.
Bob verified that there is no vertical post cap made for the VL 566 AV distributor. The VL can be modified but is expensive.