While you can call around, I wouldn't have my hopes up high. You may also want to look for other manufacturer's products to see if they make a suitable adapter.

Not sure what your entire need is, but you may want to consider selling the lens you have an instead going with a lens designed specifically for that projector. That may be less of a headache.

But, yeah, when product is no longer made and is tough to find, it can be a major headache.