I don't know much about the cd175 but the only difference I was able to find between cb160 and cb175 cranks is that the primary gears and oil rotor have different slot styles, so you have to buy a crank + matching primary gears and oil filter rotor (if yours isn't the same type already). This worked for me in a cb160 using what must have been a cb175 crank (bike came with it). Pretty sure they're otherwise identical from the part number checking I did a while back.
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