The Zacuto Z-FRM32 Z-Finder 3.2" Adhesive Frame lets you snap a Z-Finder Viewfinder quickly on and off a 3.2" LCD, like that of Canon's 5D Mark III and 1DX and of Nikon's D800 and D4. The frame attaches around the LCD by a one-time adhesive and then you can snap the Z-Finder onto it and off from it as many times as you want and it's compatible with all Z-Finders out there. (You can at any time safely remove the frame from your camera, but its adhesive will be lost).
Normally, a Z-Finder attaches by a thumbscrew system, which requires screwing and unscrewing each time you attach, but the frame provides you instead with a quick-release system. And considering the affordable cost of the frame, if you have several cameras with 3.2" LCDs, you can purchase several frames and be able to quickly move your Z-Finder from one camera to another.
The frame ships with an extender (which is also a frame), the exact kind that comes with a Z-Finder. The extender attaches to the Z-Finder and then by means of this extender the Z-Finder snaps onto the frame. Both the frame and the extender are made of reliable plastic.