360 oil pan/ 71 dart

I have a 1971 dart swinger that was a /6 and still has the /6 k member. I know I can get the motor mounts to work for it but when i was looking for an oil pan for my 360 i got a little stuck and need some help. Milodon makes a stock replacement that would switch the sump to the center, but it says 72 and up. Does anyone know if there is a difference from 71 and 72? I would hate to order this pan and end up with something I can't use. Thanks