Spacer for a short stock trap gun

[BSA Jack]

Hoping someone can give me some ideas, recently bought a nice old Franchi 530 trap gun. Someone cut the stock. I am going to refinish the stock and I want to put on a new old stock Morgan adjustable pad that I have, but still need a spacer or spacers.as much as maybe half an inch. I would like red plastic, I know there is black spacers from midway or places like that but not really what I want can anybody give me any ideas. Thanks John