Gently pull off the panel at the C Pillar. If it's a 4 door it will come off and hang down, the 2 door piece is much larger and you might have to remove the coat hook.
The mod is right there and held in by a 10 mm bolt. There are 3 wires pluged into it. 2 for the defroster and 1 for the radio anntena. Unplug, swap mods, and plug in and bolt in snugly (grounded here).
If you take the mod apart, you can souder the connenctions for the defroster and it will never break again
