Cast frame Quad Swap ?????

[cdh01]

I have a spare quad of cast frame 1972-122142's (free of rub with original cones). I'm looking to swap for a quad of cast frame 122231's (free of rub with original cones) preferably dated 71 or 73. Aside from the spare quad I also have 2-SE4122's (71 & 73) so looking to mix it up a little tone wise...and in doing so find a 31 quad that date matches either of my cabs.

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