I bought the leather versions of their upholstery (off Amazon, included vents & "Z" embroidery without additional cost), and the new foam to go with. My original seats have 250K miles, so I figured safer to have the foam. There was much hay on the floor.
I watched a coupe videos, just to get the gist of the Datsun construction. One guy used dozens of tie wraps(!). I'm familiar with Volvo & Honda (S2000) seats, many hog rings on those, so it was nice to see the way Datsun went about it.
Anyway, took the seats out yesterday, and the carpets & under-matting. I have new carpet also, so I need to clean everything up, fix the heater valve coolant leak, then put the new carpeting in, so I can reinstall the seats.
Added a reinforcing layer to the under-mats
Made new cubby inserts, foam w/ vinyl layer glued
removed the seat hinges & rails. Pass seat back upholstery was still good, but I don't want vinyl . Have to clean up the hinges & rails before they go back together. I'm missing the outer hinge covers on both sides.
Foam comparsions - new one is thicker, doesn't need the hay layer
transfer perimeter wire from originals
Started raining, so I moved indoors. Adding seat heaters while I'm at it.
Used tie wraps to add in pulling the upholstery flap through to the wire frame
Layer of felt to protect the foam
Frame wedged in place, upholstery tangs pressed into leather seam, forward flap hog-ringed in place, rear flap not yet attached
Fit seems OK
Stripped the driver's seat back
The upright foam doesn't seem to fit as well, however once the upholstery was on, it seems OK
Pulled upholstery over the head rest portion & install 3 hog rings
took a couple tries to get the cover reasonably aligned, still a little off center
forward cover stretched over tangs, then rear lip
seat heater wire brought out near the hinge