Another breath of common sense or what my mum used to call '.....the bleedin obvious' from Roger!
Re thread 14 and eye caps So far as I recall, from 1965 or so, there were only about 4 patterns of eye caps. No loop, 'no loop' with the loop cut off showing their ex No42/53 origins. Then the split types Into the late 70's with a dire quality black dyed monstrosities where the black dye was used to cover the dire quality and the later very thin poor quality L1A1 tele specific type. All types of leather was used. None of them were rare as such and the appearance of the leather was of absolutely no concern. If it was, the part numbers would have changed. And you'd still find 1955 dated old and dry leather caps coming through the system well into the L42A1 rifles old age.