They are shaped like little double ended bullets with the fuse strip set in a groove connecting the two ends.
I was only used to seeing the plastic blade type of aotomotive fuses and was quite amused by Mercedes unique design. Perhaps when they stopped with the W124, they switched to the industry standard blade type....
Called topedo fuses. Those are pretty normal in older cars......all of the older Porsches I've had use those. Oldest was a '70 911T. My current '78 911SC has them.
There are cheap ones that are made out of plastic. Those can deform when they get hot, on the higher amperage fuses. If you get better ones, they are made of some other material, I forget what, but won't deform. Worth spending the extra $2.
Standard issue with those is, that they have aluminum aftermarket twins.
Aluminum in contact with brass holder will sooner, or later corrode and perfectly good fuse sends no power.
DON'T BUY ANYTHING, BUT COPPER.
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