I'm playing a Fender '59 Bassman Reissue and I'm replacing the stock speakers with a Quad of 1966 Oxford 10L6 speakers from a 1966 Fender Super Reverb and it takes the Bassman reissue super close to the Holy Grail original. I was completely blown away by the tone and playability. The original 1959 Fender 5F6A Bassman came with Jensen P10R speakers but they are almost impossible to find today. The Oxfords are a bit more common and affordable though. I'm using a 1973 Gibson Les Paul Custom and a 2021 Fender Telecaster 1960 Relic.
The stock reissue here
https://www.youtube.com/watch?app=desktop&v=3C5Ssx0LxoQ