When you need to make some repairs to your Holden vehicle, you may be tempted to use generic brand parts for replacement. This can be a mistake for many reasons. Using genuine Holden replacement parts is always a better choice, no matter the part or accessory that needs replacing. Consider a few reasons why that is. 1. Genuine parts are designed to fit each vehicle specifically The fit of a part may not seem like an important consideration, but this can affect your vehicle repair in more ways than one.