button boxes for sim rigs are expensive and since i didnt feel like spending over &200 for one i just bought a cheap numpad and designed a holder for it for my wooden rig to use as a button box instead. I designed it for this https://www.amazon.ca/dp/B0B9HP7CNW?psc=1&ref=ppx_yo2ov_dt_b_product_details

Since there is many different sizes and shapes of numpads i wont know if it will work with other numpads without modifying the files for it.

For mounting it the holes are 4 holes 4.5mm in diameter made to slot onto any lumber 37mm/1.5" thick. i made 2 different mounts, one is vertical the other is angled at 30 degrees.