That's the OG panel design for sure.
https://gamesx.com/wiki/doku.php?id=arcade:joystick_mounts
They've got a 95mm spacing on the two M4 holes, and are designed with a bent plate in mind. These panels used an LS-32 as standard, but Seimitsu doesn't make these plates anymore. Sanwa still does, I think - the JLF-P-1S. I made some 3D printable ones:
https://nfggames.com/forum2/index.php?topic=7310.0
It was one of the first things I ever designed so they might need an overhaul, but they work.
Thanks for the info.
Looks like the following sticks would fit perfectly :
JLF-TP-8S
JLX2-TP-8S
But indeed the LS-32-01-SS would not fit, looks like that S plate is too short, and I need LS-32s for a future shmup-dedicated NAC.