I don't have a lot of detailed help but it would seem to me that a lot of shift rods have some sort of turnbuckle style adjustment for length so I have a hard time figuring that length would be unique to Kuryakin. However, the means of attachment from the shift lever to the shift rod and again at the transmission arm could, I suppose, be unique to Kuryakin stuff. Is that the issue?
[edit to add] I just looked at the Kuryakin site and they have numerous shift rods starting at about $20. Do these not fit, because I have a feeling that Kuryakin's prices are about what you'd spend elsewhere if you found a compatible replacement?
Just wondering what exactly is the desired outcome here. Maybe you just want to know what's generally available?