There are two very cool ads on e-bay listed as 58s but I'm sure they are 57s. See if you agree. The second one is a no brainer, but the first one is trickier http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3210021055&category=1317 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3210021090&category=1317 The bumper seems to be, to these weak eyes, a 57. The upper side spear is shorter than the 58s, too. Hugh