Derek,
The Vintage Model Yacht Group may be able to help.
**LINK**
Listed below are two suppliers of fittings for vintage yachts, there are probably more.
Sailsetc offer some vintage yacht fittings –
**LINK**
Nylet have been involved with model yachts since 1932 and may be able to help –
**LINK**
Hope you manage to locate the missing parts and succesfully return the yacht back to the water.