For MGA the BMC part number is 8G555
1-15/16" ID x 2-3/4" OD x 5/16" Wide

Alternate part numbers:
CNA311; ATB7354  BMC
120-900          Moss Motors USA


MANUFACTURER     PART NUMBER
Auto Seal        AS 10152 
C/R              550086
Federal Mogul    473241 (double lip)
MOOG             473241 (double lip)
National         1066 or 350918
National         473241 (double lip)
Payen            NA311 
Timken           473241 (double lip)
Unipart          GHK127; GHS104; GHS211
Weston           WR129

Applications:
Austin Healey BN1 MGA MGB
MG Magnette ZA, ZB, Mk III & IV, 1953 - 1969
MGA (all), MGB 1962-1967 (not GT)
Morris Oxford Ser 3 - 6, 1956 - 1971
Austin Cambridge A40, A50, A55, A60, 1954 - 1971
Wolseley 4/44, 15/50, 15/60, 16/60, 24/60 1956 - 1969
Riley 4/68, 4/72, 1959 - 1969

99193 - Speedi-Sleeve for rear hub seal, all MGA and early MGB (with banjo axle)