I don't know of any STC for this but you might contact Aviation Enterprises or RT Aerospace. I would guess that if you found parts you could request a field approval as none of the '73 models had the cabin side seat rails.
Looks like the floating center seat started with serial number 1672 for the non-pressurized version
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
Last edited by hharney : 12-08-12 at 08:06 PM.
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