Quote:
Originally Posted by Deschodt
Sorry about the small hijack... The floor pans have those round indentations.. inside those, there's those "cutouts", almost like a coke can pull tab... you can see them clearly in the first of the 2 pictures above, looks like you welded one closed, even. Does anyone know what purpose they serve ? I've got a 68 with no rust in the pans but you can tell those cutouts are slowly opening up. I don't recall seing these in later floor pans... Wondering if I need to break out the welder too...
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No problem! This is supposed to be educational and I love questions - I am a professor after all

I asked Obi Wan this same question a while back!
Here is what he said:The holes with the tabs are from the factory and were for aligning the car in the jigs used for assembly. Once the body was finished the tabs were bent closed, covered in sealant and covered with a small round piece of metal. I have welded mine shut but you can also close them with seam sealer as that worked for probably 30 to 35 years on my car!