I went to Carlisle a week or so ago and picked up a new gas tank for the car. I have been holding off on ordering one since I didnt feel like paying $50+ in shipping for a $150 part. I bought the tank there and carted it home. My original tank has two large screw holes in the top where someone in the past had drilled through the trunk floor to mount something and went right through the tank. Ouch! Yeah, I could have repaired it and kept it but when it comes to safety items like brakes, brake hoses, fuel lines and gas tanks, I dont play around with my life. Replace them, save the originals for posterity and don't ever worry again.
My original tank still had the factory silkscreened stencil barely visible on the bottom with the 12-20-71 date code on it. I have been scratching my head on how to reproduce it when I stumbled across the website
www.inlinetube.com and found that they reproduce the stencil! (go to their website and look under "gas tanks" and you will find it). I had to do some modifications to get my exact date code but in the end it reproduced it exactly.
Here's the original tank with the ghost image of the factory US Steel Stamp still visible (barely):