Every time I wipe down my dash board I seem to drop the head light sensor CAP down into the vent. I have used a vacuum before but this time I can not find it anywhere.

Does anyone know if you can buy this cap separately? Chevy wants you to buy the whole assembly ....

Thanks in advance for any direction in obtaining this cap. I know its not a big deal but my truck is flawless (except for a few dings) where everything works and it drives me nuts to see it missing....