I need help with this, it's from industrial organization

This is the text book "Modern Industrial Organization, by Carlton and Perloff, Addison Wesley, 4th edition."

4. Transaction Cost Economics You work for Ford helping to build a car model for which the cup-holder may either be custom-made or a standardized design. Standard cup-holders are easily available on the after- market. Producing the custom-made cup-holder for this specic car model would require Ford to invest in the development of new molds that would have no value in any alternative use; they are only useful to this one car model. If you, as a car designer, decide to go with the standard model, should Ford make it, or buy it from someone else? If you go with the custom-made cup-holder, should Ford make it, or buy it from someone else? Explain your reasoning, with careful reference to material either in the book, or in the notes