I just wanted to add a couple notes on the XT tank install. I did mine slightly different but took the inspiration from this so I thought it appropriate to give credit where credit is due. Here is what I did on my two bikes.
First, the hockey pucks are a great idea. I made them the same way Guitarman did but ran them through my band saw and split them, meaning, I used 1 puck per bike. I just put a couple washers between the frame and puck.
I found some scrap fuel line and heater hose in my stash and slipped a piece of fuel line inside of the heater hose making a sleeved rubber mount for the rear. (Sorry, I forgot to measure diameters as they were just scraps I had in a box).
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I used the supplied rear mount bracket but bent it an additional 90* and flipped it upside down. Then I worked it over the short section of hose.
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The pliable mount allowed me to bend it back to drop the tank in place then bolt it down.
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The petcock fits but it's close. For the seat I used a heat gun and bent the tongue down a little. This really helps since the XT tank is a little taller.
I trimmed both side panels but I'm not sure the right one absolutely needed to be. It's held to the frame with a ziptie at the front. I put a split section of vacuum hose on the leading edge of the left cover to protect the fuel hose.
I'm pretty happy with the end result. I have bar risers and I can go lock to lock with no contact. Aside from a little foreskin wrinkling on the seat, you'd never know it wasn't meant to fit a TW.
Side note: I know it's fashionable to bash Clarke, but both of mine were fine. I did find a small flaw at the very bottom right side of the white one. It was only about 3/8" long but the blue tank I ordered was fine. Shipping was fast too. White tank was on my doorstep the day after I ordered it.