A Body Seat Tracks repair question...
I just did a set of tracks last weekend for my friend's 1970 Dart that were seized with gunk and dirt. He had them sand blasted but a good wire wheel brushing also works just as well. Nobody's going to bend over that far to look under your seat to see if they are perfectly smooth. I put the track in a bench vice and sprayed the crap out of them with a silicon lubricant (WD40 works OK to). Now you can release the lock mechanism and slowly get them moving again. Keep adding more lubricant and aggressively work them back and forth and they will soon slide like **** out of a goose!
Trying to take them apart is a waste of time and not really necessary since the two large roller bearings will work smoothly after they are oiled or greased up. I also had a connector wire missing and I just cut a length single strand stiff wire to match the length of the other side and twisted the ends through the lever holes. Just cut the missing tensioner metal strip from a scrap piece of tin and you're all done.
If you are converting from a bench seat to buckets, make sure to locate the mounting holes correctly. The outside floor pan holes are 8 inches from the outside edge of the floor pan. The inner holes closest to the centre hump are about 12 inches away from the outer holes. All Dart floor pans had bench seats actually have two dimples hammered into the floor pans for where the bucket seat tracks are mounted. Note that the bucket seat cars also had a special set of 1/8 inch thick reinforcing plates welded onto the floor pan where the studs go through for added support.