There's a good chance neither will fit perfect out of the box. Even NOS fenders might need a little work. And aftermarket will almost for sure need a little massaging to get perfect gaps. The last 1970 AMD Challenger fender I fitted last year was so bad I just fixed the original fender and put the new AMD on a shelf. IMO, there's no bolt on perfect fender available on the market. And besides the fitment with AMD and Goodmark, they will all need holes fixed to make them look somewhat like 1970 challenger fenders. Sometimes I wonder if the guys working at the repop factory are blind?