Stuart: I think your deck would fit any of the other tractors in the same series as your 86. It is a "wide frame" made from 1971-74 so the deck would fit another 86, or a 108 or a 128 (all gear drive like the 86); or the Hydrostatic tractors in the 1x8/1x9 series, a 109, a 129, a 149, or a 169.
It should also fit any of the Quietline series made from 1974-79, like a model 800 (available until 1/76), a 1000, a 1100 (11 HP Briggs & Stratton engine), or an 1200 (all gear drive); or the Hydrostatics of the same series, a model 1250, a model 1450, or a model 1650.
The 82 series uses a different configuration for the front pickup, so your deck won't fit unless it has three holes on the front.
I don't think the deck will fit the earlier narrow frame tractors very well. But never having owned a narrow frame, its difficult for me to say definitively if it would fit or not.
Besides the physical fit-up of the front and rear hangers, there is also the belts to worry about.
I would stick to trying to fit it only to the early wide frames and the Quiet Lines.