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@gbj_tester
Chance of finding a 3-arm GS crankset in that condition and >170mm: negligible.
Chance that you'll notice the change: even less.
It feels odd because it's a different bike, and you've read the crank length on the back. If somebody switched the cranks on your regular bike for something 2.5mm longer or shorter without telling you, you wouldn't notice. In fact, you wouldn't even notice if they only did it to one crank.