Here are a couple links to get them...
Last tire at the bottom of the page
http://www.smahummer.com/prodlist.jsp?cid=7&start=7
Another
http://www.teakatoys.com/products/sh...uct_id_97.html
A little pricey if you ask me. Then again I am a cheap bastard so everything is expensive to me.
S&B Member since '03