Hi everyone, posting here on behalf of Leo Hulnick, who uploaded this great selection of Harley competition gas tanks to the K model page on Facebook. I messaged with him, and he is happy to have them posted here also. Some of these are super-rare, and I'd not seen them before. What a lineup!
"Something new, something old, something borrowed and something blue. Not all but representative pictures of the evolution of the Harley TT roadracers. 37-39WLDRTT 5 gal GAS/OIL, 52-53KRTT 4 gal., 54-59KRTT 5gal., 60 KRTT 8gal., 61-65 6 gal., 66 frt cap, 67 rear cap, 68-68KRTT 6gal. 74XRTT 4 gal. short course. Feel free to correct any errors."