Bucket Seat and Floor Shift Conversion

I have a 1972 Plymouth Scamp 318/904. It originally had a bench seat and I just today started to mount the bucket seats I bought at the Mopar Nationals. The seats are supposedly out of a 1973 Scamp. I found the dimples in the floor where the factory would have mounted bucket seats and drilled to two outer holes and they fit fine. But found that the inner studs on the seat track was not even close to the dimples in the floor and the seat track on the console side sits way higher the the floor after the door side studs are through the drilled holes. I know AMD makes a bucket seat reinforcement plates. Does that correct the height problem or Did Chrysler changed the floor or seat mounting in 73? Also, I want to changed my car to a floor shift and can not find anything for the conversion since mine is a 904. I have found a few 727 kits unless I read them wrong. Any tips, information, or personal experiences with either of these problems I am running into would be greatly appreciated. Thank you in advance.