Fwiw the change in diameter wasn't 60 -> 62 but rather 1985 i.e. late model FJ60's still have the 19mm pins.
I personally don't believe there was a difference in the u-bolt plates for the cable locker variants, the EPC doesn't support a part number change. I've got both out in the parking lot...
The rear shock pin diameter (on the U-Bolt plate and cross-member side) and subsequently the shocks/shock bushings & u-bolt plates themselves did change on the rear of the 6X Series fwiw.
8/1980-~1985 = 16mm diameter
~1985-1/1990 = 19mm diameter
I say ~1985 as we've seen a bit of blurry months...