some times like 'this instance'
the best replacement is from the MFG, either from a dealer or the factory service center
AFAIK there is no 'after market' 3rd party 'parts'
at one time in the 80's dometic sold them under their brand, but they were mfg HWH
I can explain it to you.
But I Can Not understand it for you !
....
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1997 F53 Bounder 36s