MGB - classic British car wiring harnesses and components BritshWiring is your complete source for wiring harnesses, components and accessories for your classic car restoration project. wwwishwiring. View Cart My Account About Us Contact. 1975 MGB GHN5 368082-372612 1975 MGB GHN5 372613-386600 1975 MGB GHN5 386601-410000 1976-78 MGB GHN5 410001-471000 mgb wiring harness | eBay Find great deals on eBay for mgb wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword MG MGB 1975 Main wiring loom - harness. Pre-Owned. $179. Buy It Now. Freight. MGB WIRING HARNESS 1974. Pre-Owned. $149. Buy It Now. Freight.