Hitachi CP-S225 projector - spec for screws

Question

I need replacement rear foot adjustment s***w for my Hitachi, but got quoted £18 which seems excessive. I also need 3 screws to attach a UNICOL ceiling mount to it.

Could somebody tell me what to buy if I go to a harware store for the 3 ceiling mount screws - and any idea where to get the rear foot s***w for a sensible price, or perhaps you could suggest an improvisation?

Thanks

Brian