Help needed to determine which antenna will fit

I have a 76 duster and I was looking at purchasing a reproduction antenna base and mast but it appears that the 75 to 76 year have a slightly different base and bezel than the 70 to 74 dusters. Is this correct? If so will a 70 to 74 antenna work fine anyways? I assume the 70 to 74 and 75 to 76 darts and scamps are different also.