I think i need something like this
https://www.tubesandmore.com/products/jack-plate-plug-and-play-mono-stereo
In their layout i can't find the 4x12, but should be the same of a 2X12 with 8 Ohm speakers.
The last on this pic...
I use the reissue; worth the 85 euro i paid for it (new) some years ago. Don't think there are rare components to make the old different from the reissue.