If you're looking to extend your vehicle's wheelbase, Topline Products Wheel Adapters may be a suitable solution. These adapters are designed to convert a 6X5.50 (139.7Mm) bolt pattern to the same size and center bore, with 14X1.50 studs and a 1.25" thickness. The machining and finishing of these adapters are top-notch and give a professional look to your vehicle. One of the downsides to these adapters is that they can add extra weight to your wheels. This can affect your vehicle's overall performance, especially if you're using the adapters on a vehicle with a smaller engine. Additionally, some customers have reported issues with vibration after installing these adapters. Overall, Topline Products Wheel Adapters are a decent option if you're looking to change your vehicle's bolt pattern. However, you should consider the potential performance and balance issues before making your purchase.