For $135US, you get the Kartboy shift lever, knob and bushings. Plus, Tom is a forum member and a nice guy, so you know the customer service is gonna be top-notch. He even kicked down some stickers and a free shirt when I got my stuff.
There might even be a GB going on right now. If so, the price will prolly be more like $105 shipped to your door.
(direct)Get the Kartboy!!
I've never had any problem with the heat-shield. I gave it a little tug, and the shifter clears fine.