What are these sensors on the inside of the lens mount?
When trying to investigate a broken auto-focus on my Canon EF-S IS 15-55mm lens, I found the problem (a broken flex cable) but also created another (I broke a different flex cable)
I'm ordering a replacement for both but on the part I broke (the lens mount ring) I'm really not sure what the two sensors are that the ribbon cable connects to.
Nearly all the replacement parts for sale don't have the sensors and the ones that do are quite expensive. Do I really need them?
Picture of the lens mount *with* the sensors: