66/67 B Body Seat Track Interchangeability

I know that the 66 B body seat tracks are adjustable and the 67 are not, and that the floors are different. But I don't know what the difference in the floors is.

I have 75 Road Runner bucket seats in my 67 Coronet now with 66 seat tracks. I had to make adapters for it to work correctly. I don't know if the difference is in the floor, seat tracks or the Road Runner seats why the adapter was required.

I am going back to the original 67 bucket seats, and was wondering if I could stay with the 66 tracks or if I need to put the 67 tracks back on. Its not a big deal to go back to the 67 tracks, but the 66 tracks are already cleaned up.

Any thoughts?

Anyone?

66-70 floors are the same. Should be able to use the 66 tracks.
The later seat didn't fit the earlier tracks.

Thanks!