KEH has the Canadian 90mm Summicrons listed as using 48mm filters. I had a 90mm Summicron back in the mid-1980's but I don't remember if it was Canadian or German. I think it used 55mm filters.
No idea of the specific Leica/Leitz part number for the lens caps.
It does take 39mm filters, but the current cap is a poor fit, as the overhang is terrible. I use a Nikon 52mm pinch-type cap inside the hood. Works great.
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