I ordered a set of ebay ceramic copper fuses and they are perfect, I had a colleague test them at work along with the OE tin fuses. Both blew out at same power draw.

I dont know of W123 that much but wouldnt it be better to use the "coffin fuse" for the blower like the W124 used, it was afterall an update called in by MB.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)