GS4s Headlights Jul 1, 2010 17:41:48 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by colin on Jul 1, 2010 17:41:48 GMT -5 In 1941-1942 all 30 GS4s and GS5s had a single bulb on the upper headlight . in the 1950s SP replaced it with the twin beamed seal type. Why.