First twin leading shoe types from Sept 1964 up to 1967 pre MK2 with 0.8125" bore size.Gasket not supplied-see
37H3833. Lockheed,2 of these per r/h hub required and sold singly
Repair kits for these are
8G8816.
Later cars used 0.9375" bore size
GWC126.
If using on
37H2013 back plates you will need to slightly elongate bolt holes for wheel cylinders as the bolts will not quite fit in.