Does anyone recognize these seat tracks? They came on a set of 69 seats I purchased recently. They fit the floorboard on my 69, but do not look like the ones on my original seats. The originals have a much longer adjustment bar, and different ball bearings. .On the rear floor mount bracket, there is a hole on only one side, on my originals, there is a hole on both sides of the bracket.518A3774-F6E4-41F6-B3C4-B1F001C9F97C_zpszba5azdf.jpg