1157 is 1157.... I'm using the CREE units in my 2 LM's For best illumination I've moved the bulbs to the rear of the housing.. see http://corvaircenter.com/phorum/read.php?1,881605,881605#msg-881605 Matt Nall Charleston, Oregon http://tinyurl.com/The-Corvair-Patio http://tinyurl.com/Matts-Tech-Pages