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I replaced mine with this from amazon:
https://www.amazon.com/gp/product/B01IBRJTIW/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&th=1
I checked the seal by placing a light inside at night and looking...

I made one myself. Not hard. Used 2 inch angle aluminum. One 20 foot piece and a couple feet of 2 inch wide flat bar.

Is it still available and if so, what area of Alabama is it located?