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Mad elcetronics has a relay kit that will make your headlights brighter. the key is to take the power from a better source and channel it through a relay to produce more light. The kit with those headlights should step up our older cars to newer standards.
Most newer domestic cars(muscle car era) with round lights are most likely the 5" for the duals or 7" for the singles.
 

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Oops...not exactley 5", but I think the ones in the auction would work because the 5 3/4 and 7 1/4(?) are industry standards. Anyone else know the exact sizes?
 

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MAD electrical is a great site wih a lot of information. Too bad they sometimes put up information that isn't quite accurate. I have nothing to sell and nothing to gain. The "Brighter Headlights" article has some serious flaws in the math.
 

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You notice that big black rubber boot in the picture? That goes on the back side. My son put some similar to those in his '68 Impala and had to cut the radiator support for the rear part of the bulb (where that rubber boot covers). Not just the headlight bucket but the radiator support too! I'm not sure who he bought them from but they look similar. They look cool but check the hole in the rad support, it may have to be opened up.
 

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Headlamp sizes:
2-light round setup: PAR56 = 7"
4-light round setup: PAR46 = 5 3/4"

In the lighting biz, lights are sized in eights of an inch. 56/8 = 7".

Oh, and those round aftermarket spotlamps you see? PAR 36 = 4 1/2"

Cheers,
mark.
'71 Fodor
383 "Smokey"
 
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