Park sense sensor question

[RednBlack]

I bought the kits to add front and rear park sense to my truck from infotainment.com. Their kits came with these little black circle stickers to put on the sensors (I assume to protect them and black them out?). One of the little stickers came off in the car wash the other day and I can't seem to find any replacement parts online? Are these stickers not necessary? do they normally just come with the sensors? I reached out to infotainment and they will sell them to me, but want more to ship them than the stickers are worth, so I'm looking for other options. Thanks!