4.5% (~752 'Cudas) of 16,710 US spec. '70 BS23s had factory floor mats, and they were color-keyed to match the carpet.

My R/T is one of 6.0% (~820 Challenger R/Ts) of 13,668 US spec. '70 JS23s with factory floor mats C92.

I could use a black set, but have never seen a set (or individuals) for sale.