Generic dimensions:
1.3750" (34.93mm) ID x 3.0000" (76.2mm) OD x 0.6875" (17.46mm) Width
With External Retaining Ring
6K885 - Bearing, GB input shaft, 1500 - (with external groove and retaining ring)
97H512 - Bearing, GB input shaft, 1500 Com. (G) A1861, Fin (G) MS8010
6K885 - Bearing, GB input shaft, 1500 Com. (G) MS8011, all 1600 and Twin Cam
. . . Yes, they changed it back to the original part number.

Ball Bearing, Gearbox Front
all MGA and early MGB through 1967.
1113232          NISSAN
127-200          Moss Motors Ltd USA
2-2001           Victoria British Ltd
6K529            BMC, British Leyland
6K885            BMC 
6K885            Brown & Gammons
B3052G           BAP GEON

Manufacturers
11132-32         NISSAN	
119G             SPORTSCAR
8110435          NASCO
LJ138G           R&M
LJ138N           RHP
LJ138NR          RHP
LS1212K          FAG
RLS11N           SKF
RLS11NR          STEYR