M-2 seat back brackets

[47lincsled]

 These are the small seat back on an M-2 between the gas tanks and the side boxes,I got lucky and friend found a NOS set somewheres and sent me the dimensions,so I thought I would post them here as well. Bob.

[bright87]

Does anyone have the dimensions for the seat back itself? I assume it is wood, covered by a canvas cushion.
Thanks-Michael

[47lincsled]

 Hi, I used 3/4 inch plywood for my seat backs with threaded inserts to screw the backs to the brackets,I drew up a plan for the backs but of course it's not in my file folder, I'll get some specs tomorrow.