The standard size is 18” x 26” which fits the standard opening of 14” x 22”.
Your challenge is that the standard height is 4”, not 9”.
Amazon has a large assortment of standard skylights for under $100.
I suggest that you call (probably next week):
Total Value RV
Elkhart, IN
866-282-4460
Their Parts Dept specializes in Thor.
They can at least provide you with verified info on your specific specs.
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'17 Vegas 24.1
Fallbrook, CA
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