I have been thru this as well as many members here has. The kicker breaks falls apart and you can't find a replacement. I don't like too mix parts but necessity prevails so I can ride. if you look in the pics I use a 350x kicker on the large splined 200x. if you have the small spline you are kinda stuck. the large spline is right at 3/4" across at the widest point the small spline is approx 1/2 in at the splines I hope this helps as not riding stinks