The 1965b may be perfect..but needs some foam and a ply back or,to be at its best,a center brace.Change speakers in a 1965 cab?
Its already perfection
The 1965a is a little different and may benefit from even just a single g10m to pump up the bass.
But that if you really like some powerful bass and your amp is shy on bass
That has been my experience with them.
They surely are perfect for home practice stock