Looking for Avenger owner with 3d skills

I am looking for someone that can make an STL file of a bag rider for an Avenger air rifle. The rifle is capable of great accuracy but it I find it a challenge to obtain that accuracy with the contours of the stock and using bags. I did not know what a bag rider was till recently (learn more here: https://youtu.be/4EmIYgyBDzY), now that I do I see how it increases accuracy by providing a flat surface to steady the gun on bags much better. I want a "wedge" that would compensate for the tapered angle of the stock and attach to the bottom of the stock with dog ears that would fasten to the recessed sling attachment point (see picture). I have 3d printers and can print these pieces for anyone that can provide me the STL file.

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