Has been quite awhile since I had to address this problem but I think it was AG Parts Ltd. or something similar to that name, was a large outfit. I was surprised at the time that the clutch parts fit a couple of Massey tractors too, I do remember that much. Maybe a model 1534 or 1535, something like that. Mine is a 2001 Mahindra 4110.
I have the Mahindra shop manual (pretty crappy manual) but it at least had the spec I needed and I fashioned a gauge out of some threaded rod, flat washer(s), nuts etc. You have to measure the distance from the face of the flywheel to the "face" of the fingers where the release bearing rides and do this with it all assembled, that's why I put the flywheel on the bench and install the disc & p. plate and torque everything down like you are putting it into service and then take your readings and make adjustments. There's only the smallest area to get a reading from on the flywheel face with everything in place so you just have to wing-it making the gauge.
The 3 bolts have a castle nut w/cotter pin to make the adjustments, each bolt adjusts 1 of the fingers. On the original p. plate and 1 of the remans I bought, it's 3 individual fingers that the release bearing rides on. On 1 of the remans I bought, those 3 fingers have a flat plate similar to a thick flat washer that attaches with little springs to the fingers themselves but the adjustment is the same.
You'll have to find this height spec for YOUR tractor as differences in release bearings, case designs/depths and linkages will have tremendous affect on it. I remember my first time on this I just eyeballed it all and got the tractor all together and I had NO clutch operation within my linkages adjustment range !! If I remember correctly I was only off adjustment by approx 1/4".
I wish you the best luck with your tractor.
