Geistware,
In the link from Tower about the FP-TP-FM module, the description title says TP50 & 72 FM, meaning that it comes in either 50 Mhz or 72 Mhz. Also, down in the tech notes it says:

"INCLUDES: One 50MHZ or 72MHZ Transmitter Module"

So, according to Tower, it is the correct module for the 9C. Tower's descriptions can and have been wrong in the past, so knowing someone that has actually tried this module on the 9C transmitter would be the way to know.

Jesse