This mounting plate has a similar hole pattern to the Sanwa Denshi JLF mounting plate which is widely used in many arcade controller and cabinet set ups.  The corner holes are set with a more oval shape to allow more flexibility for various installs

To install Seimitsu LS-32, 38 or 40 joysticks to our High Grade Aluminum panel for the HRAP 2/3/EX, this is the panel you will need, along with the shaft extension as this setup will lower the shaft height without it