Might want to look into a guide to see if anyone else has modded the HSS-0136. Depending on how close the stick is to arcade standards, you might have to do some shaving of the button holes. Also, there's something really important to mention about Seimitsu buttons that I probably should have mentioned before:
- PS-14 screw-in buttons: Looks like a standard Japanese button with a convex surface. Surface area of the button is a little smaller than the equivalent Sanwa, with a slightly thicker bezel. It's in style for the button and the bezel to be different colors. Also come in transparent varieties, where you can optionally add lights or insert your own artwork.
- PS-14 snap-in buttons: Look wider than the standard Japanese button, and have a completely flat surface. These are the buttons in the Hori RAP EX-SE. They're rather unique as far as buttons go and have slightly different characteristics than their screw-in counterparts. The transparent version of these buttons are harder to find - for good reason, I'm told.
- PS-15 snap-in buttons: These are similar to PS-14 screw-ins in terms of outer characteristics, but are much more shallow. I had to use these once in a stick that didn't have enough clearance to fit a PS-14.
Also, you've probably figured this part out already, but you want to go for 30mm buttons, not 24mm.