i have 72 cuda buckets on my 1966 barracuda seat tracks,,,i dont remember its been many years,,,,but it couldnt of taken more then maybe just a new bolt location,,,was easy to modify
I've got a set of bucket seat tracks from a 69 Barracuda bolted to 77 Volare buckets in my 72 Demon
I believe the problem comes when you need tracks for the cat equipped cars. The DS inner track is different then IIRC.
I dont know why the 68 tracks wouldnt work. I thought they were interchangeable from 67 up to the appearance of the catilytic converter (1974?) that put the hump in the DS floor that changed the DS inner track.
Like I said in my previous post, I'm using 69 tracks in a 72 with no problems.