i sent a picture to Grohe tech support and talked to them. it is their Classic Model faucet. the hot and cold cartridges are different because they rotate different directions.
classic faucet
45883 cartridge cold on rt
45882 hot on left
there is 3 zeros after the part number on some sites.
classic faucet
45883000 cartridge cold on rt
45882000 hot on left
the entire handle pulls up and off. then use a 17mm socket to take the cartridge out.
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