There are current reproductions for Pontiac, available from pretty much all the Pontiac parts distributers. You could try one and have someone modify the logos.

'69 Hemi Charger 500, ‘70 U code Challenger R/T
(These and a bunch others at www.dkowal426.com)

P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."