Anybody have measurements for idler arm bracket holes?

[burlapen]

I put 1972 spindles, steering box etc on my 63 C10. Apparently the idler arm
Bracket mounts in a different location on the frame. You can see the '63 mounting holes going the opposite direction just to the right of where the new one is c clamped on. Anyone know exactly where I should put the holes for the new setup? I'm afraid if I eyeball it things will get wonky real quick. Thanks.
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