If you look at the gateway connected to your primary A/C you may be able to get a more searchable part number....at least for the Dometics, the gateways used on the primary and secondary A/Cs are the same.
Entering your RV year/make/model and doing a parts search at https://www.trekwood.com/ may also yield the appropriate part...although once you get it, you'd likely find it cheaper elsewhere.
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2022 Rockwood Signature 8324SB
2019 F350, SRW, 6.2L, 4.30 gears
Sold: 2020 Keystone Cougar '1/2 ton' TT, 29RLKWE
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