Exterior bracket was cast by Autolite #141L & 141R. The interior bracket was #181L & # 181R if I remember correctly. Unity Model CH spotlight. The handle is also stubbier than the regular Unity spotlight handle. There was also a bracket from Unity #31 & 31RH which was a universal type bracket in the shape of an elongated tear drop that was installed through the door or cowl.
http://www.unityusa.com/
Would really like to see what you get. I waited 20 years for the template for my lights which I`ll be installing this summer.