bed roll lights

does anyone havethe bed roll lights on there pickup...how do they stay in there without popping out?

I don't have them but did talk to a guy at a show about his. Some come with an O-ring to make a snug fit without rattles, and some say to put a bead of clear silicone in the roll, insert the light and let it dry to hold them tight. Either way it's a friction fit as I understand. Don't know why you couldn't get an assortment of O-rings in different thickness and custom fit them.

thanks for info...pete