Reference: CMP seat back coil spring dimensions

[Bob Carriere]

Standard heavy duty key FOB rings work perfectly.

Or make your own........ we have seen on a few trucks that the rings were actually washers of approx. 1/2 inch that had been drilled at four location 90 degrees apart......noon..3..6..9 on the clock.

Spring stock is available from US distributor in 3 or 4 foot length...... the user needs to cut them to size and open up one ring/turn to create the hook.

We also luck out at a flea market and got a lot of springs, supposedly used for furnace dampers, and they are the right size and stiffness and using key FOB rings made a few of our own seats. Key FOB rings were available by the bags on EBay........ cheaper than buying by the item at a leather shop.

Cheers