Thanks for the help. Interesting the 1991 find, that could benefit me...Ive gotta try and find some more documentation that indeed it was possible to get factory installed disc brakes at that time.
And yes Bilgemaster, you're right, there is all sorts of funny business going on with swapping years and paperwork. I worked with Enfields in Delhi and bought this one there, its a legit 79', I put the disc brakes on myself, but now wish I hadnt.