55.2-59 How to repair this area?

[BBPanel]

From the backside it looks like this is an overlap seam. Hard to determine the extent of rust above and below the hole. I'm thinking I need to cut out the entire seam and butt weld in a replacement piece. The other three similar areas look ok (no holes) but the seams are a little bulged in places and that makes me think they might have rust in them also. Anyone dealt with this before? Thanks. -Bob

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