I am in much the same position though it’ll be a long time before I really need to worry — there are much bigger bits missing!
However if someone can let me borrow the bits or can supply dimensioned sketches I’ll make some up. Well, it’s a job that’s got to be done at some time or another!
While in scrounging mode I am also in the market for a chain-guard, a toolbox, two transfer port castings, a right hand crankcase door to Pilgrim pump casting, a speedo might be useful too. All for a DPY 600cc engined 1950 Squirrel.