Are all utility buckets created equal??

[Livrat]

Since no one seemed to want them at the time, I dissected the seats pictured and stashed the tracks, Gave a set to a buddy and sold the drivers side on the parts board,
My buddy came over and asked. "how do these go on" we looked and figure out they were wrong for his seat.. Darn!!

Then sold the drivers tracks to a board member and just found out they did not fit his seats either.. hmmmm..

Does anyone know if they are different between the years like the bench seat tracks?? (bench seat 67/68 tracks are the same, 69/70 same, 71/72 etc..)

Been working on these trucks for over 30 years and am still amazed at what I learn new all the time!!