Do they make TEV's for R407c?
Yes, Sporlan, for one, has a special thermostatic charge for R-407C that has been used for the chiller market. It is a slightly adjusted R-22 thermostatic charge to provide a better adjustment range for the TEV used on R-407C.

Every application where we have purchased TEV's for R407c we have been given R22 TEV's?
This is typical, and should not present any problems. Keep in mind there are still lots of R-22 TEVs and systems being manufactured, and the usage of R-407C is, at the moment, small in comparison. A manufacturer producing both R-22 and R-407C units will find it desireable to stock only the R-22 valves.