Thanks Guys,
This advice was from the Oz Morgan agent here in Melbourne. He (apparently) sourced the info from Morgan UK! For technology decades old it completely threw me. Moreover, I thought the wire wheel would be flush with the drum for added security and remove reliance on what are quite short small screw bolts! I have emailed Morgan but will now contact Brands Hatch Morgan as recommended. Forking out GBP 2000 for parts alone did not go down well with my "manager"!
That's not possible because wire wheel hubs fit onto an aligning taper leaving them necessarily proud of the brake drum face as with most wire wheels. The four setscrews holding on brake drum are more than adequate if correct washers are used and they are tightened sufficiently.
