Early production MGA did not have a rubber seal at the front of the gearbox. Those gearboxes used a mechanical scroll seal. They can be converted to rubber front seal by installing the later model front cover. If you would be converting your clutch to MGB type diaphragm pressure plate type, that pressure plate is thinner and requires the clutch release arm to be located farther forward. For this application you can use the gearbox front cover from 1962-1967 MGB 3-synchronizer gearbox. All MGB gearboxes use the same rubber front seal as the late model MGA.

    Seal Dimensions:
Inside Diameter:  1.062 in (27.0 mm) -- 1-1/16" shaft size
Outside Diameter: 1.756 in (44.5 mm) -- 1-3/4" housing bore
Width:            0.312 in ( 7.9 mm) -- 5/16" seal thickness

    Original MGA part numbers:
BMC		  1H3138  Com.(g)A8011
BMC		  22H475  New part number

    Additional part numbers:
BMC		  88G545
BMC		  OS4498
BMC		  1A3636
BMC		  9204Z90
BMC		  ATJ2034
Moss Motors USA	  120-300
Victoria British  2-2250

CHRYSLER    10653  (C-R or SKF)
CHRYSLER    E95841M
CHRYSLER    T869
CLARK       102175
DELCO       298315
GM          36868
GM          44793
FORD        E0A4248
NAPA        10653  (1/4" wide)
STUDEBAKER  670844

    Manufacturers:
ABV         471718
AIRCOO      28X740
ALLISC      51611176002
ALLISC      5161117605002
ALLISC      5161117606002
AVCO        111632
C-R         10364
C-R         10365
C-R         10642
C-R         10652
C-R         10653
C-R         10658
C-R         10659
C-R         10680
C-R         17312
C-R         17511
C-R         17511M1
C-R         17512
C-R         17512M1
C-R         500787
C-R         501695
C-R         502330
C-R         507211
DIC         106173TB-H
GARDNR      60G85
GARLOK      211580325
GARLOK      211580326
GARLOK      215270325
GARLOK      63X325
GARLOK      63X326
GARLOK      65X325
GARLOK      65X326
GARLOK      66X325
GMCOM0      7042868
GMCOM0      07046823
HERCUL      111632
JMANVL      01066771SS
JMANVL      4648B
JMANVL      6771SS
JMANVL      6775LA
JMANVL      7032LA
JMANVL      9276LPD
JMANVL      9276LUP
L&S     A54248S
MCCOR       80437
National    471705
NOK         BB0150E
NOK         BB0150E0
OEM         471718
OEM         50232
OEM         50232S
REPCO       PR3909
REPCO       PR5030
Timken      471705
TROSTL      44230
TROSTL      44231
TROSTL      A54248
SCHWIT      C108190
SKF         10653  (1/4" wide)
SKF         10655  (1/4" wide)
SPICER      SKT44976
UNIVER      102175
VICTOR      48678
VICTOR      60286