Fyi just because it's not from Japan does not mean something is not Toyota. When I interned at TMS in Torrance for a few months in2007 I worked in corporate accessories doing supplier quality management. Things like if the wheels for the higher trim levels were to spec, color matching spare tire covers, gas and brake pedals and how to implement The Toyota Production System to help suppliers. Many options you get are TMS not Toyota Japan. TMS does port installed accessories and dealer installed accessories. An example of a port installed accessory is the roof rack on the FJ Cruiser or wheel locks. All weather floor mats were often dealer installed. Where it goes in is a function of demand, market and supply chain. A very successful TMS accessory may become a Toyota Japan factory accessory in time as they notice the demand (think back up cameras or in this case radios)
Toyota uses suppliers to manufacture components for their vehicles up and down the production stream. The difference between a Toyota and another product IMO is not the engineering because frankly engineers jump between companies all the time, rather it's the quality of the parts they put in. Regardless of if they are installed at the factory, the port or dealer, they all have to meet strict Toyota standards which often far exceed those of the competitors. These are all Toyota parts.
