Sorry it took me a while but I had to get out the old bearings and measure.

These are the 2 bearing that support the gear box input shaft on the FL400.

#16 on Hondas Parts diagram
part number 91007-HE0-004
Honda parts diagram shows it as a 62/32
standard 62/32 bearing measures 65mm OD , 32mm ID, and 17mm wide
91007-HE0-004 actually measures 65mm OD, 32mm ID, and 14mm wide

The stamping on the oem bearing is SC06A33 JAPAN PX NTN (very hard to read)

#17 on Hondas Parts diagram
part number 91008-HE0-000
Honda part diagram shows it is a 6007
standard 6007 bearing measures 62mm OD, 35mm ID, and 14mm wide
91008-HE0-000 actually measures 62mm OD, 35mm ID, and 12mm wide

The stamping on the oem bearing is SC07A08 JAPAN PX NTN (very hard to read)

It appears that both Bearings are thinner then the standard bearing.

All other gear box bearing appear to be standard bearings.