LeBaron sedan serial #'s, 100199 to 100320 and LeBaron 4 door hardtops serial #'s 100175 to 100327 had these part #'s: 1690828, 1690829, 1690830, 1690831. These I think had the Crown emblem.Just looking at my '57 parts list (because these number are beginning with 16...) and the numbers you gave are the '57 rings (and 58 i think but i can't be sure, i haven't the '58 list + you state some 1810... parts number which could be '58 parts). The '57 rings have no ornaments, only plain..
-- Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F Imperial 1957 Crown convertible Buick 1996 Roadmaster wagon - 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