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Awesome bit of onto, thanks K9Vic !! Merry Christmas.All Unity spot lights are the same diameter for the shaft, but come in different lengths for each application. Yes you can buy the mounting kit for our trucks and just about anything 0-60 years old. You need a 27 installation kit for driver and 27RH for passenger side. The exact model is 325GM, but you should be able to find a used one that will work as long as the shaft is long enough and has an adjustable chuck lock for the bracket.
http://shop.unityusa.com/27-Installation-Kit_p_757.html
http://shop.unityusa.com/330GM-0002-6-Round-Spotlight_p_1123.html