Paul,
I just made my own and installed it last night. Started with a roll of gasket material.
placed gasket material over top of studs and stretched tightly.
Took a small brass hammer and tapped the top and bottom stud to make an impression on the gasket material
Used a Leather Punch Kit - Largest size punch tip was same size as studs - Kit was all of $5.00 at Hobby Lobby or Michael's
refit gasket over two studs and placed nuts on top and bottom to hold barely in place
Repeated process of tapping L and R studs while holding gasket material tight
Punched out 2 additional holes, placed gasket material over 4 studs and tapped remaining 4 studs to make a make
with 8 holes now punched, I checked gasket carefully to make sure all holes aligned and trimmed with leather punch as needed. I used a wooden board under the gasket material BTW while I was punching it out.
With gasket fully seated I trimmed the outside to fit with an Exacto Blade or Utility Knife with a sharp blade
Outside gasket material removed, I followed the same process to trim out the inside. Check inside the Diff to make sure no material fell into the diff and everything is clean on the inside
I cleaned all oil and grease and junk off of mating surfaces with a painting PreClean. Lots of dirt and grease came off an already cleaned pumpkin mating surface.
Applied thin layer of Hylomar, Hylomar is a wonderful product that seals but does not get hard. Spread the layer thin being careful around Studs and applied gasket when Hylomar got tacky
Google Hylomar Blue to order on line to get the real stuff. Mfg in Cincinnati now.
coated top side of gasket with thin coat of Hylomar. and again used PreClean on the pumpkin side. Again lots of dirt and grease came off.
Installed Pumpkin, Tapped into place with a piece of wood. Added new bolts and lock washers,
Tightened by hand and short socket wrench in a Star Pattern Criss Crossing on opposite sides until all felt tight.
Walked away for 10-15m and used torque wrench. Could not find Torque Values to used same sized bolt value for Rocker Arms which is 25 ft pounds,
Tightened to 15 lbs in Star Pattern. Kept going round and round at 15 lbs until all were uniformly tight at 15 lbs. and then followed the same procedure to torque to 25 lbs going in a Star Pattern.
I was amazed that the same bolt tight at 25 lbs. needed 2-3 repeat attempts to torque it at 25 lbs to get a uniform torque on the diff on every nut.
Followed at the end with a clockwise circular torque and still found a few more nuts that would take a little more torque to get it to 25 lbs.
Does it leak? Will know in another week. And yes I hope I don't have a clunk when I put the wheels on the ground and the tranny in gear.Don't know yet but this entire process of gasket making took all of 15-20m and actual Pumpkin Install 20 m tops.
Hylomar, good good stuff. With Free Shipping 2 tubes around $25 on Amazon from a Range Rover Specialist out East.