See also in the Sportsterpedia;
….. *57-85 Oil Line Routing
….. *Pics and Information on stock IH Battery Trays and Parts

Click on any pic below to enlarge:

The 2 shiny ones below are 62-65 NOS tanks. Note that one has a notch in front mount bracket. A mistake?
The chrome one is also 62-65.
The 4-fitting tank is 58-61. It has the full rear weldment.
Note the bent supply fitting on the chrome tank. It's like this because of overtightening the drain plug.

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Aftermarket horseshoe tank (no drain): ^{11) 12)}