I can’t remember the exact years, but the early TD 20’s have those 2 piece cast aluminum tanks. They are great and virtually indestructible. No dents. Be sure to clean out the fuel filter inside.
If you get around to making your TD run, you will need new Leather Primer Seals and instructions to install them. If so, just call me at 231-929-7479 or you can find order instructions on one of the previous posts about TD’s TN’s HD’s AT’s LT’s etc.