I would think that by 55,there should be the girling units ,but with the alloy forked cast lower end.........I assume the ally emds are threaded onto the girling shocks..............You cant fit standard girlings ,as the mounts are different........The red oil will be Dexron autrans fluid........which is what I use........I find that Matchless forks have stanchions of vry soft steel,and easily bendable.................with the advantage ,easily straightenable,without worry about cracking heat treated high carbon steel,like BSA s......seals are no problem......but wear in the alloy sliders is.......if worn excessively,they will need to be replaced........seen prices for new of around 200 quid each......kinds steep.
