I assume its a Big Red cab. If so you easiest options are IL Eurostick or Sanwa JLW. Buy or make a custom plate and you can fit a JLF or LS series
Hey I am just curious what type of custom plate you are talking about. I know that FA, AS, and PAS all offer several different mounting brackets for Sanwa and Seimitsu joysticks.
I plan on putting JLFs in my dedicated big red 4 slot, as I've grown very accustomed to the Japanese style levers, and I have almost all mounting plates except for the "S" plate. Of course it would be my luck that the custom plate you are mentioning is a plate I do not already have, but please let me know if you have a chance.
Also, tyvm for the advice on the dustwashers, that has been added to my list.