I don't have the specs yet myself, but I'm planning on fabricating what I need. I have partials of both seat frames. Need to fab the seat back for the driver's seat frame and the bottom seat frame for the passenger seat.
When I finally get around to doing this, I will give you what details I have.
1953 M38A1 MD54216; 20988792; 40-I-160I B-35
1954 M170 MD-A10513; USMC
1964 M416 1/4 Ton Trailer