[Mopar '68 & newer dog dish caps are 9" OD diameter (8-5/8" ID).

The '67 & earlier used a 10-1/4" OD cap, & they were 9-3/4" ID. [/quote]

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Slightly incorrect , A bodies were 9 inch caps before 68.
That I know of A bodies were never 10 inch caps....

Frank