John - Here's the only thing I could find at the moment for the EL 168 Wiring Harness

I found the EL 168 harnesses listed as being sold by Chev's of the 40's as well as Classic Parts. Doesn't appear to be much help as it only lists one #13 wire. Sorry frown

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)