When it comes to 60's - 70's wheel accessories I buy any center cap or knockoff I find at swap meets etc.
I deal in aftermarket wheels and accessories not OEM factory parts. Wire wheels included.
Just send me a picture of the cap you are looking for. Descriptions just dont work.
Old Style Plastic Center Cap
Pic # 34 2 1/8" Screw Spacing
In the 60's & 70's most of the aftermarket wheels with 5 ear center caps used the same basic cap with 2 1/8 " space between 2 side by side screw holes.
There is a difference in the base out line of the OLD and NEW style center caps as well as the screw spacing measurements
American Racing NEW style Center Cap
Pic # 35 New Style has 2 7/32 Screw Spacing
Ansen 5 Ear Plastic Cap
Pic # 369
Shelby 5 ear Plastic Cap
Pic # 324