This file is the head with the lens fitting is V2, thanks for the support!

Hi, just purchase this great model (my fav ever Eddie \m/.), I see there`s 2 heads, i cant see any difference in them, i thought one would have a fixing point for the eye lens and one wouldnt, but the lens has a peg to locate it onto the head, but neither heads have a hole for it to fit into ?. does it just stick to the side of the head ?, and what is the difference between both heads ?. Cheers.