I just bought 4 used sensors off eBay because my new to me 2013 NV2500 was missing the outer driverside sensor. With that 1 sensor missing, none of the other sensors seemed to work. I plugged in the missing sensor and everything seems to work fine now. I didn't pay the 500+ or even 200+ per sensor so I'm a happy camper. Now what to do with the 3 extra sensors I have left? Anyone interested in buying some sensors? I'm think 50 shipped per sensor is reasonable. Let me know On a side note, the plastic mounts like Decades printed above were pretty brittle on the sensors I bought. Maybe because they're old or something but the one I installed cracked a little while I was plugging it in. Doesn't affect the functionality though.