Yep, I've bought numerous sets of the aftermarket "deluxe" side marker lenses from eBay, Amazon, and even dedicated truck parts suppliers for 67-72 C & K series trucks. I've owned about 15 of those trucks over the years. They all eventually have one or two, sometimes all four, in the set that loose the chrome trim. I put that info out on one of the vanner groups on Facebook a couple years ago, guy argued with me and said he pulled on them and they felt fine, that I was just trying to get him to ruin his by bending the chrome. He apologized a few months later when his chrome trim flew off going down the road as it always does. I love those things, but I'm thinking about making custom markers for the QAR van just so I don't have to deal with the darn things and can have something unique.
I bought a Gorilla glue 2 part epoxy to glue them on with... Do you think that's enough or is it a regular maintenance item that should be redone periodically?