Can I use a 67 904 on a 72 225 or is the crankshaft register hole size a problem?

I have done some research, and as near as I can find out, the 67/older small register flexplate, is not available new. The 68/newer flexplate is still available from most part stores. Any one looking for the early flexplate, do not believe the catalogs for the applicaton years. They show the same part number from 62-87, this is not correct. I spoke to ATP, Dorman, and Pioneer, about this. Dorman no longer does flexplates, ATP and Pioneer, had no clue as to what years fit what. Hell there tech guys probably weren't even born when the early part was still being produced. The engines that used that flexplate haven't been made for 46 years.