I have the snap type Extang cover and have had some issues with the snaps...
I find if I spray the snap button where it snaps over the stud section with silicon spray once a month the stuck snap issue is greatly reduced.
If you rip a snap stud out of the cover, you can replace the snaps and sockets easily with supplies from car cover companies...or in my case, I buy off of Amazon....
The snaps are all standard 1/2" boat cover style and come in chrome or black finish.

