These are the wing mount, not shock mounts.
The easy option is to contact Fibre-lyte, if they have ever produced a part in the past it is likely to still be in their database so easy for them to make them again. If they don't still have them on file you can produce the DXF file they can use to make some more, if you haven't got access to a CAD program then they will charge more to draw it out for you.
If you can get a drawing of them I can reproduce them in fibreglass sheet for you and I might have some Tomy spares somewhere but I do know I haven't got any shock mounts. I'm in Stockport as well so we can be sure my shock mounts will fit.