Your VIN is within shouting distance of mine (1344)!
Would you look at the owner's manual, on the back page there should be a part number -113 584 XX 96, what are the XX digits in the manual you have? What is the date - this is also on the back page with the format similar to 3.67 (or reversed).
Does the power plug for the round spotlight fit in the lug on the firewall? It appears to be larger. That is not what was available at the time and appears it would be for the cigarette lighter.
Thanks