Shitfer spline size

[cgborders]

So I'm working on my budget rearsets. question I have is with regards to the shifter splines. Are there other bikes that will fit? I know some are using XB shift linkage but those seem pretty pricey. Any tried anything like a honda or suzuki to see if they fit?
Basically I have all the way to the shifer, just need a way to connect the shift linkage to the shaft on transmission

 

[Doxgon Racing]

While converting my Blast for Harley-style forward controls, I took an idea I first saw on the forum to machine off the toe peg of the stock shift pedal, then to drill it near the new end to attach the bolt for my heim joint. Since you are trying for rear-sets, the limiting factor would be if your linkage rod could clear the derby cover on the primary case