You just have to cut some material maybe in some cases to get them close.

I'm thinking even from the factory they were not perfect judging by that picture above of a original dash pad. Or maybe the sun has caused the dash pad to shrink and move around form 40 years of sun?

I have installed 2 UR dash pads, neither one was perfect around the AC vent holes. I had to trim padding the get my vents to fit halfway right. I think I have some pictures?