You can use the parts catalog and make up a list for Richard. He probably has them all or, if not, you can use some longer ones and cut off to length for ones he doesn't have.
There is a seller on Ebay that sells variety packs of 50 or so with the correct heads. I bought a pack a few years ago just to have a selection of spares for several of the bikes I have around here. It avoids having to go buy individual screws when one gets messed up or lost. Do a search on "bridgestone screws".