Grind off the old weird ass brackets and then you have a flat track. Then weld up some new brackets with bolts on some pieces of steel plate. Put the bolts through the floor holes, set the seats on the plate, the rotate the plate under the tracks and mark with a marker, then pull it all off, trim the brackets and weld new brackets to the bottom of the tracks. paint and slap em in.
I really don't have any pics of the process, but here's a comparison of the tracks though.