Another story for why the third row is rarer than the second row, and the second row is harder to find than a front set of 47-55 Suburban seats, is that the seats were removed to carry things. The seats were later forgotten or disposed of, after the Suburban was no longer a people carrier.
This almost happened to me when I put my Suburban into barn storage between 1975-1979.
There is someone who fabricates the rear seats for 47-55 Suburbans. I think that bowtietim might have a set or know about them?
