Since this has only 3 wires, yes you have a custom switch and that is the only one that will work. I am guessing that you will find a little black box in the dash that is the brains for the turn signals. An interesting point, you may find suitable replacement items on a BOATING parts site, the Yamaha parts are used across many of their product lines. The problem is that many of these sites do not provide enough info to make sure what you are ordering will work in your cart. I would suspect the little black box is the problem and not the switch, but I am not familiar with this specific design.
Depending on your electrical capabilities Signal Dynamics provides suitable devices, but these are hard wired in. If you cart has the latest "industry 9 pin connector on the wiring harness, you may find an RHOX unit that will work.
You might be able to find the service manual online and this might have the actual part number that you could use to find an alternate source.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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