MRcycles showed none available. there was a site 2040 that showed them for $100. Have you thought of replacing the whole cable set up? Top-bottom they may be set up for the same lengths to fit and should be usable. Ask enduronut-deet etc.

I plan to do just the lower throttle cable that goes to the carb because that's the only piece that's bad but if i find the whole unit for a fair price i may just buy it. Ill find something its just a matter of when. Right now my hands are full with the front forks and the 360 thats been fighting me for 2 years.