Ther's a pair of '58 Imperial valve covers on ebay : http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2400685901&category=34202 If you look at the 2nd pic you see an old decal about spark plugs thread size. i had this decal on one valve cover of my wrecked '57. But in same condition as on the ebay pic ! Is this decal being reproduce ? -- Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F Imperial 1957 Crown convertible Buick 1958 Roadmaster sedan HT - American Car Club de France (ACCF) : http://www.accf.com - Chrysler Imperial France (C-I-F) : http://www.ifrance.com/c-i-f - Cadillac " Standard of Excellence " : http://www.ifrance.com/accf-cad - SportsCars : http://www.ifrance.com/accf-sprtcar