Ron, I have a set (top and 2 rears) from a CAV that I replaced with oval-holed ones if Mark's doesn't work out. You can have them for postage. 11 13/16 x 17 13/16
They're chromed, though, so paint may peel or chip.
The panels were sent yesterday and will probably take a week to get there. I got your e-mail and it would be great to get the further details you mentioned.