seat covers

[Private_collector]

Both my seat bases had the twist to lock type.
If they weren't original it would be a bizarre coincidence, as the seats were not a pair, but from different vehicles. I chose the best pair from a few that I have. The fasteners were older than moses, and the cushion set I bought (reproduced from original canvas) had the matching part that fits, suggesting the maker expected this style of fastener.

Because I didn't make them myself, I can't help with patterns.