I used these in my impala (4 bulb) they were pretty nice, I'm not an expert but.........
~~TECH INFO. / NOTES~~
Set contains (2) 7" hi-low beam bulbs. They will fit, and be correct for, all 1959-69 GM cars & trucks with a 2-headlight bulb system.
Only Lectric Limited's Headlight Bulbs are:
* Brand new reproduction sets
* Produced using original GM blueprints
* Correct, having the original T-3 and GUIDE insignia
* Improved for better brightness and longer life
* Officially Licensed
* Made by an OEM manufacturer in the U.S.A.
Don't sacrifice safety with burnt-out, dim, cloudy, pitted, discolored, hard-to-find, or incorrect headlight bulbs. These bulbs are brand new. Great care was taken to improve the photometrics and candlepower of these bulbs in order to meet the current Federal Highway Safety Standards, without compromising the original lens prescription.
http://www.lectriclimited.com/images...og/SB6169S.jpg
http://www.lectriclimited.com/shoppi...p?id=172996162