Blackface — #125P1B — stock size, uses 1″ lamination with 1 1/4″ tall stack
Silverface amps had same PT, but marked as #022772 (early) or #L010020 (later)
Mounting hole spacing is 2″ x 2 1/2″ — ** Also works in Fender’s reissue ’65 Princeton Reverb amp