Here’s what I have - the passenger is original to the ‘63 I believe, the driver is later, it’s like the one in my ‘65. I haven’t found a ‘63 (really ‘62) seat, I think they’re similar to the FJ25 seats from what I’ve been able to find.
Driver’s
I used the SOR kit in my ‘65 that had the foam, covers and screws. It worked and figured that would work for this one if it’s used. I have a metal back for it. I would remove the slider mechanism - not needed for the SWB fixed top, as I would never need to move the seat forward unless a five year old was going to drive it

. That looks like it will reduce the seat height by an inch or so. That’s ok, given the passenger seat doesn’t have the springs. I also need to remove and replace the hold down thingys on the front where the tool box clips secure - these are at 9” spacing or so and the early triangle tool boxes use 7” spacing.
Passenger’s
I think this is original. I also have a metal back for it. Not sure what’s used for base for bottom as well as back. If foam, ok for back but bottom needs something firmer? Don’t think those three wiggly spring wires would suffice by themselves. I think the FJ25 seats are similar, and if so then the bottom cushion is attached only along the front so it can be tilted forward for access to fuel tank (why though?).
It would be nice to have these seats the same height (bottoms), that’s the way it is in my ‘65 FJ40. Which means if I use both of these I’ll have to do the driver’s first since it’s taller then match the passenger as best I can.
I forgot measurements. Next trip to the shop. Looking for 7 missing cow/calf pairs, lots of time in the saddle. Giddyup
