Holy misinformation! Only need to match-up the flywheel and stator. Any 701/650 CDI will work just will need a jumper wire for 62t and the rev limits and timing curves are slightly different, 6m6 having a bit lower rev. You can mod the limiter yourself if you want. If you're putting a pipe on it I'd recommend modding the rev limit(or getting a modified one or an Enhancer but if you're gonna invest that kinda money seems like zeeltronic is the way to go). Otherwise slap a 61x CDI in there and call it good it it's a stocker.
And yes finding a used bracket isn't too hard. But putting a roundnose pole on a square is a great upgrade! Just depends on your intentions with this ski.