I'm looking for a bit more variety of products like this:

I can't seem to track any others down. Most of the adhesive-backed mounts are the push-through kind (no screws). I'm trying to mount the stand-offs to plastic, so I could always epoxy the more traditional threaded stand-offs to the plastic, but if I could find more like the one above (but with other height options), that would be ideal. Any ideas?