Heres a ebay link to the Delrin shift knob I've used. Not fancy, but the best feeling knob in your hand I've ever tried. Never hot or cold and super smooth and fast shifting. Lowers the knob on the shaft for quicker shifts too.Just talked to him and he's going to make one for me after I get him the right thread size.

http://cgi.ebay.com/ebaymotors/DeTom...QQcmdZViewItem