A method of installing a seat belt system (100) into a passenger compartment of a vehicle, the system of the type including a seat belt retractor (501), a height adjuster (102) and a web guide (104), the method including the steps of: a) providing a height adjusting mechanism having a bar or track and a carrier; b) securing the web guide to the carrier so the height adjuster and web guide form a subassembly; c) locating and securing the retractor to a desired location within the vehicle and; d) lifting the subassembly and manipulating the height adjuster to a desired location in the vehicle and securing the height adjuster to the desired location, wherein the step of lifting the subassembly simultaneously locates the web guide to its desired location.