Suburban rear seat mount questions... hardware and interchange with '60-up?

[Brad54]

I'm wondering if anybody has a pic of the original rear seat hold-downs for pre-'60 Suburbans. I'd like to see what the original carriage head bolt and wing nut look like.

I've got a small 3/4 x 3/4 cast "saddle" that went over the seat frame tubing to act as a washer on the rear seat of my '61 Suburban. I'd like to see the rest of the assembly.

Also, can anyone tell me how similar the rear seats are for Pre- and Post-'60 Suburbans?
The tubing on the '60-up is 1-inch in diameter. Are the earlier seat frames the same?

-Brad