Roll your own. They require, if I recall correctly, just a 16 pin header connector with .100 socket spacing and a DB25 to connect up to the TQ3370 radio interface box.
Hall had the diagram. If not, it should be in the reference pages on repeaterbuilder in the back of an s8xx control head manual or possibly the Rangr manual.
Know anybody who wants both UHF and 800 MHz Rangr radio chassis? It's a VRS system, actually. The UHF radio is very low power, 100 mW I think.