Reddit reviews Valterra T05-2285VP Universal Adapter - Thetford to
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PART# 64731Allows standard waste valve fittings to be used on white Thetford valves3″ standard bayonet x 3″ Thetford bayonetWeight 0.285714286 lbs
Check this: https://www.amazon.com/Valterra-T05-2285VP-Universal-Adapter-Thetford/dp/B0006N5S6C
It may be what you need. It was what I needed for my 1977. Good luck!