when i was doing mine i could not find any metal to match exactly even through my old AG stores its like it was a bastard size.
my choice was to use 16b guage sheetmetal and sika flex 550 i believe rivet down to the tops of the ribs and cover it with foam board.
i wouldnt recommend the normal spray foam from the big box stores because it is an open cell foam which can wick moisture i dont remember ever being able to find a true closed cell spray foam in small quantities.
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