The 123 replaces 4 cyl. distributor
123MG4RV is designed especially for the MGA and MGB.
0 MG-A DM2/40510 set static at -10 degrees, HC at -5 degr.
1 40916 18GG (LC),18G,18GA,18GB,18GD
2 40897,41155 18G,18GA,18GB,18GD,18GG(HC),18GF,18GH,18GJ
3 41339 18GK
4 41370 18G584Z, 18G585Z
5 41491 18V672Z, 18V673Z
6 41288 18V581F-18V583F-18V581Y-18V583Y (HC)
7 41290 18V581F-18V583F-18V581Y-18V583Y (LC)
8 41032 18V (HC)
9 41234,41391,41692 18V892AE, 18V779F, 18V780F, 18V893AE
A 41610 18V846F-18V847F
B 41599 18V797AE, 18V798AE
C - intended for ‘stage 2’ engines
D 41600,41643 18V801AE, 18V802AE
E 41693 18V883AE, 18V884AE
F 41695 18V890AE, 18V891AE