3 Synchromesh "S" part numbers

[e-type]

I have 2 "S" gearboxes, first is 22G333 with 22G232 laygear.
Second box is 22A1522 with 22G204 laygear. Is this a late casing with early gears ?

What would be the right box for Juni/Juli 1964 1275 S and a late 1966 1275 S ?

Thomas

[timmy201]

There is a good reference sheet here on the main site
http://mk1-performance-conversions.co.uk/gearboxes.pdf