Bolt pattern adapter?

I have a 72 Duster that I'm trying to get the finishing touches on before it becomes my daily driver. I know the bolt pattern on it now is 5x4, but does anyone know where I could get some kind of adapter plate or something like it to covert it to 5x4.5? I have not been able to find any wheels that I like for under $100 each for a 5x4 pattern. But I've found lots on a 5x4.5 pattern. Help, please! Does anyone have any suggestions? Thanks in advance!