Turns out potential lead on the rears doesn’t want to sell just the armrests. Wondering if I can modify or remake the later style using your pictures. The base rectangle looks yo be the same, the main difference is the angle of takeoff of the upper portion, looks angled forward by about 10 degrees to create that room at the top edge and then a longer horizontal top piece.
Can see clearly when looking at the tan interior (later) compared to my red interior (earlier) that the tan armrest sits protruding more forward on that rising portion whereas my red one is tucked behind the edge of the rear seat.