I have a couple of Unity S-5 spot lights that I want to use on my 47 Ford. The one at the bottom of the pic is about 2"-3" longer and has 11-L bracket which is not for Ford. The shorter one is about 12" long but I can't find any markings on the bracket. I know the Ford needs a #17 bracket.
Let me look at the two Unity's I've got. One is NOS and has the Ford logo on it with mounting template. The other is a really clean used unit.
My good friend Bob Birch at AccessoryLand is a dealer/guru of all things Unity. He can be reached at (563) 580-8805 or (563) 556-5482.