Handles were made for left and right side for the Pentax 67/6x7, but obviously with right handle would present quite a challenge operating the shutter release handheld! The left handle is still very common, but adds additional weight to an already heavy camera and with handles on, there is no means by which to attach a neckstrap, such as OpTech's very good neoprene straps that magically make a heavy beast of burden a pleasure to haul.

The magnifier for the Pentax 67/6x7 is especially designed for that camera; additionally, note that if it is bumped during transit, it can break the viewfinder eyepiece bezel, and these are very scarce as spare parts. Wearing magnifying glasses (as I do) is a better choice.