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I am hoping this helps anyone doing the tribar install for their 57. I bought a pair of tri's from The Hoffman Group and put them in the 57 with slight mod to the bucket. 1st pull out the seal beam, keep in the foam from tribar(apparently they are worth money to numbers matching or points guys).2nd flip bucket over and trace tri base to back of bucket with a marker then cut small sections with tin snips and bend backwards with channel locks , finally even out with ballpeen making small taps against folded over ends. It will be a snug fit in the bucket but if you cut about1/8" out from stock hole should fit well and simply plug into factory harness then reassemble using stock parts. I did not need to run an auxiliary inline fuse or have fuses tripping in the ATO panelbox and the pulsing from the generator didnt affect the lighting like in the sealed beams. The engine still has the stock generator and the headlights have had no issues.
 
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