1957 Chevy Classic Update Wiring Harness Kit | 500434 Replacing the wiring harness in any 1957 Chevy Bel Air, 150, 210, Nomad or wagon is a good idea from a safety and reliability standpoint. Replacing it with a wiring harness that easily allows you to plug in modern conveniences is money well spent. 57 Chevy Wiring Harness | eBay Wiring harness is new, made in the USA. Also includes wiring diagram. Fits: 1957 Chevrolet Belair 210 150 Wagons 265 283 w/Generator. This product can expose you to a chemical known to the state of Ca..