Fellow in Australia has built the dies for the front sight hoods. I'm waiting to hear from another CGNer what he thinks of them and then I'm going to see if I can get a few. He is talking about making dies for the MkII nosecap. Makes sense as it fits the broadest spectrum of Ross rifles. I believe they were used as replacements for MkIs, used on MkIIs and early MkIIIs. Correct me if I'm wrong.
Larrysmith, is your rifle a full length barrel or shortened? A similar type nose cap could be used for a 'tanker' if that's what yours is, with a shorter fore end like guys have been doing a bit with Lee-Enfields.