I just filed down one 8-Amp brass, and one 25-Amp copper fuse, and it appears that so far the "fastvw99" fuse sets seem to be the real thing, as there was no change in color of the metal at the filed down part.

I will now do some electrical tests in order to determine their internal resistance, which I estimate will be of very low value, and not directly measurable by a regular DMM in order to compare them to a known good original fuse.

But by running a known current through them and measuring the resulting voltage loss across the fuse, one can easily calculate its resistance, and so have a way of comparing them.

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W163 ML230 EURO SPEC 1999
W124 300E 1986