I will send you a photo of my '50 COE seat frame by private email. It is just like you describe and I believe the rest of the seat frame is the same as one for a standard cab,
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix