Hey Woody...unfortunately, the OEM tail lights are ultrasonic welded (melted, fused) together. I don't see any feasible way to seperate them other than getting crazy with the Dremel.
I don't remember if the Depo tail lights you have pictured are welded or glued, though. I sold my set after buying the Dectane TLs from you.
I'm always up for a new experiment if you want to go through the trouble of shipping. No charge for you, of course.