I'm sure you could "piece" one together. I decided to just bit the bullet and buy a new one for my 96 205. I will be honest----best money I've put in the boat so far--And it's not just for my wife when pulling me on a ski---it works great for the kids skiing, kneeboarding, and yes even on that "bastardly" tube.....
Point is get a speed control however you can---you will be happy!!
You haven't lived until you grab a wild hog by the legs when a dog is holding him by the ear!!