Originally Posted by topside
Unless the car was a very late build - what's the SPD? - I doubt that happened on the assembly line.
While I don't know why the seat would be changed, 50 years is a long time...

Car was built in early June. Jim (RhinoDart) said he remembered a car fitting the description back in the day with bucket seats.
Maybe this is the same car that had the bench put back in many moons ago, but used a 70 front seat instead of the correct 69.

1969 340 4 Speed Swinger R4,
black vinyl, white butt stripe, 3:91