Thanks H -- thank all for the responses. The proper mounting kit (110) that is discontinued from Unity for a 55-59 chevy would have had a template. There are a couple of 110's for sale on ebay but they have old Ford car templates and are very pricey. I have a working spotlight that has a flex mount bracket that I will be using or create my own, When I do get it done, I will post detailed picks of the locations installed spotlight on both forums.
Why --- it fits the theme of my 59 GMC 100 Fleet Forest Service truck.