New direct-replacement backup lamp switches for the T850 in the SRT-4. RockAuto has new ones for $130+ and OEM is over $200! We've found a direct replacement switch that threads into the T850 with the correct dimensions and made an adapter harness to allow it to directly replace the factory one for much less!
If the connector on your harness is damaged, we have that connector available as well. Only $10 for the mating pigtail to the backup lamp itself!