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Mismatched crank lengths (probably very stupid)

If I could pick your excellent brains, I've been offered a left-side Dura Ace crank with powermeter at a bargain price, it's 175mm and my current Ultegra cranks are 172.5mm (which suit me very well). I assume it would be daft to ride with mismatched cranks, even though it's only 2.5mm?

Thanks!

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