From: bill504a_REMOVE_979045_THIS_@yahoo.com
Goodyear and probably others actually have slicks for 13 by 6 inch wheels - about $150 apiece. There may be DOT approved drag slicks - search the web.
[This is message #34020 by user bill504a on Yahoo! Club GM HBODY: http://clubs.yahoo.com/clubs/gmhbody ]