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I tapped the projectors to fit a "normal" screw size, real easy to do for anyone with the proper tools, shouldn't be too hard to find someone to do it for you.
They are metric and most local places have a **** selection of metric, especially the small diameter and long length needed. I used sae threads on the couple retros I did as well, just run a tap through, they are such small holes and thin metal it's no big deal.
Yeah, just tap the holes in the projector that the screws for the bracket need to go into. Like 99 GS3 said, they tapped really easily, Id never used a tap before and it was real simple.