I picked up a Trek 500 recently. It came with one of those Sakae CR turbine cranks. I quite like them. But curiously when I pulled them to service the bottom bracket, I realized the crank arms were two different lengths. The drive side is 165. I'd love to find a matching 165 crank arm for the non drive side.

I don't suppose one of you fine folks have one of these hanging around you might want to sell/trade/give?

If not, any suggestions on finding a decent mate? I suppose it could also be a different crank arm that looks similar enough and takes the same spindle length (I'm assuming this is necessary), if such a thing exists?