Idler Arms 3917581A vs 3917581B
I have a couple of original 69 Idler Arms here and wondering the significance in the 2 different part numbers? Can anyone with knowledge chime in on this?
3917581A = Heavier Beefy looking Idler Arm
3917581B = Lighter narrower beam Idler Arm
Are they both either manual or power steering? One is lighter than the other in terms of beam thickness?
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
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