So you are after a set of extractors and/or a spacer?

The spacer would be hard to come by. They are not a common item and would probably need custom machining to produce.

I would be careful on selling those extractors as A15 extractors if you're not entirely sure they are what they are. Having said that It isn't uncommon for a bit of grinding of the flanges to ensure proper/decent fitment.

You might have to upload a picture of the extractors fitted to really clarify.

Best bet for the adapter is to get a flange custom cut, if I were you I'd fix the core problem and invest in some extractors that fit.