Many types of "mil" coatings that are grey, but most likely was parkerized or grey phosphating.
There's also grey Bearcoat (industrial Teflon-S weapons finishes, pretty much cured the jamming barretts during GW1), but it would be quite expensive to do a set of rims.
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1984 300D Turbo - 4-speed manual conversion, mid-level resto
1983 300D - parts car
1979 300TD Auto - Parts car.
1985 300D Auto - Wrecked/Parts.
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"If you don't know where you are going, any road will get you there". Lewis Carrol
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