Rear seat?

It may not be. The later cars had the rear corners of the seat bottom clearanced for the retractable seat belts that were added. I know my ‘74 has them, but I don’t know exactly when that type of retractor started. It may have been ‘74, so a ‘73 seat might be different from a ‘75.

@Alaskan_TA posted this, this is a ‘70 seat bottom compared to a ‘74. I’m not exactly sure when the change occurred or if it included the entire ‘73 model year. {ATTACH=full]1715492669[/ATTACH]

Hang on now.....

That photo was to show the difference between a regular seat frame & one for a Space Duster with the fold down rear seat.

Things can get whack when taken out of context.