I know you said you are looking for the straight style but if you change your mind and settle for the D style I have a pair of 15 x 8.5’s They have a 5 x 4.5 bolt pattern and are brand new. Have a 3.75 inch backspace. I bought these and the tire combo did not fit so I had to get 8 inch wide.

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1970 GTX 440/727, B5/B5 1970 Barracuda conv. 318/3spd, EW1/R4 1974 Cuda 383/727, FM3/X9 1971 Barracuda 318/727, GK6/X9 1966 Coronet 500 413/727,White/Black 2010 Challenger SRT 6.1/6Spd, Tor-red/black