Chris, you may very well be the first person, ever, who has restored shock or spring color on the Mangusta! But at least, the parts manual lists 2 options each for front and rear shocks. Decarbon is the only description, and applied to one of each choice. The color Denis sees in the build sheet is for the spring, where the rear is noted as yellow and black: Which I believe means black with yellow markings (even if not apparent on ‘1046).
Springbok had Detomaso-supplied NOS spares, using the “decarbon” part number but instead from Ariston. Alternate part numbers in the parts manual suggest there could have been a different vendor (well, at least, leaves the question wide open). Note that the springs Springbok had in their NOS stash match the flat-silver finish on 8ma1046 fronts.
But truly authentic color for the fronts may be “underspray splatter” !Lee
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