Look What UPS Just Delivered!

Gonna replace damaged panels on the car. Where do I get shielding gas and cylinder? They are much cheaper online. I've see a size 3, 80cf bare cylinder for $192. Full for around $230-$2400 from same supplier. Any suggestions, experiences with and suppliers?

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At first i thought that car the welder is on its a 66/7 belvedere but the top of the fender is too narrow.

The lines on the fender are real pronounced, what is that car??