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1937 Chevrolet Truck wiring harness install

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I am working on a customers 1937 Chevrolet truck and looking to install the wiring harness and have a question as to where the harness goes through the firewall.  There are two holes in the firewall, one on the passenger side that is about 1 3/8" diameter and one on the drivers side that is about 3/4" in diameter.  Pictures below show the two holes, the passenger side has a grommet that I just installed.  Which is the correct hole to run the wires through?  I believe it is the larger hole on the passenger side, but want to ask those that may know.

Thanks for your input.


2017-07-10 00.36.44.jpg

2017-07-10 00.36.57.jpg

2017-07-10 00.37.16.jpg

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