hi Gray_Ghost
recently took some photos of fixing a seat for one of my truck this summer, attached a few photos of the clips in action.
the original tiny metal clips are spring steel, they will stretch a lot
if you need clips i suggest a trip to the wrecking yard, i took all the clips off a couple seats and cleaned them all in evaporust liquid overnight so that i would have plenty of good ones to pick from when reassembling the seat.
the grey material i used is recycled school bus seat from a bus i bought to use as a storage shed.

i suggest you do a test fit with a small patch of material to see how it goes before committing to the whole project,
just push them down with your weapon of choice, i put one about every 3 inches or so.
don't forget to preload the seat a bit so the material is snug, i put my seat in a 20 ton press, but barely loaded it down.
i hope this info helps, please send picks of your work!
-s
Attachments
seat.jpg (617.47 KB, 252 downloads)
new_cover.jpg (402.63 KB, 264 downloads)
preload.jpg (423.46 KB, 264 downloads)
ford_filling.jpg (493.78 KB, 258 downloads)
clips.jpg (465.29 KB, 247 downloads)