CMP Seat Springs

[Tony Smith]

The seats used in CMPs, both Ford and Chev (not only in the cab, but also in various other locations on other body variants), use a solid base with a tubular rear frame and the back cushion is supported by a number of springs in a grid like array connected by rings. As the spring material is a thin gauge, high-carbon steel that has been worked to form the spring, these springs are prone to rusting away. Although the seat frames them selves are usually in good condition, the springs are often missing.

In an effort to reproduce these springs, does anyone have the specs for the 24 springs and the 9 rings that join them? The specs required are the guage of wire, length, dia of coil, number of windings, etc.

Even better, has anyone used their own measurements and had some made by a spring maker and can provide details and prices?

Also, just a local Australian note. Australia had a "Wideback" version of the CMP seat where the 2 tubular uprights at the back diverged outwards, ie not parralel. Did the Aussie seats use the same springs and stretch them, or were they longer?