Seimitsu Joystick in TvC Stick

I currently have a Tatsunoko vs Capcom fight stick, and I want to put a Seimitsu joystick in it. Here’s some links to what I am looking to buy.

My question is where exactly do I put the mounting plate? Does it replace the one on the joystick itself or the one that’s on the metal plate with the button holes on my fight stick? Sorry if this is a stupid question, I’m just pretty new to this stuff.

Yes you need both. You unscrew the flat mounting plate from those 4 corner screws and replace it with the SS plate. Make sure the that the pin connector faces away from the buttons when you bolt it in. Also note that the pin header on a Seimitsu is flipped upside down from how the TvC stock stick (a jlf clone) is. If only down works, then you plugged it in upside down.

Alright, thanks for the help.