OK, I know what the part number is but it doesn't appear to be in the CMP Chev parts book, so I was hoping someone will have a book with it's true purpose noted.
Group 1205A Part 2417140. The part number was not quite distinct on the pack.
It's a spring, about 20mm or 3/4" long, painted Chevrolet engine grey.
What it is similar to is the spring on the front bolt on a cab where it meets the bracket on the chassis, under the hole for the the crank handle, although it is slightly thicker and shorter - a pair of them would make about the correct length.
Pardon the blurry image - it's getting dark outside!
