I'm not sure I understand your question. This hood is designed to fit the 50-500mm F4-6.3 G APO OS HSM lens which works with both full frame and APS-C sized sensors.
The question is about the hood only. The hood that came with my Sigma 50-500mm lens is visible in the view finder when on my 5D Mark III, but not visible on my 7D. So, I wanted to know if this hood, which is different than the one that came with my lens, will work on my 5D Mark III.