YnZs Yesterdays Parts; Manufacturer of Classic and Antique Since we use an original wire harness as a pattern, we can guarantee our product to fit perfectly. Take a look at a 1941 Cadillac wire harness. Exact Duplicates of the Originals The wire harnesses we manufacture are exact duplicates of the original. We use original type lacquer-coated braided wire.Wire Harness Catalogs · Electrical Supplies Catalog · Contact Us · Our Products · Online Store Exact OEM Reproduction Wiring Harnesses for Classic Our wiring harnesses are brand-new and better than N.O.S. (new old stock) THE PROBLEM: Let's face it folks, NO automobile manufacturer ever designed a wiring harness to last 30-60 years. As a matter of fact, your vehicle's original wiring was only designed to last 10 years before it started to deteriorate! There is ample documentation to substantiate this claim.