I have never seen a patch for the are you describe. If the doors are really bad I would look for replacements. I patched the bottoms of mine but the rust was small and I was able to just weld in small patches. You could also look for a door that has a bad skin but a good bottom to get your patch panel from. When/if you cut the rust out I always use my mini blaster to blast and paint then inside before I weld my patches in. HTH
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"Ah, trust me, I can get a LOT stupider"
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