i lost my Indigo 2 cord at a show last night. will this one for the Polar fit/work?

[CleverConQueso]

This cord is basically universal. IIRC the power supply (the expensive part) on your synth is internal so you should be in good shape.

There's a version with one round side and one squared side which would work in theory but won't fit into your synth without carving at it with a razor. Basically, if it fits, you're fine. Look around your house, you may already have one - 12 bucks seems like way too much money for something that would come for free with something you'd pay 12 bucks for.