I checked one of my transmissions, the ball used can be either 5/16 or 8mm diameter. Many hardware stores have loose ball bearings or get them from a bearing supply.
From a dealer the part is # MF540010


Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.