Gardentractorpullingtips.com Isavetractors.com Those might be good options...also there are forums that you could ask the question on also that may have better ideas
I believe that 1200 is a totally different animal than the 86 and won't work for you, besides those parts are too valuable to try to alter them to fit the 86 you have. That 3 pin driver plate is real costly not to mention the $200. Bushing it takes for the special 1200 drive shaft!! I suggest you take all the 1200 parts and keep them together safe if you ever need them for a 1200. Just go buy your 86 parts.