When I was searching on how to work the new internal clutch on the 2005 NV4500 I swapped into my 92 3/4 ton I kept seeing the opinion that the master and slave cylinders should always match up, that is, have the same year etc. application. But I really did not want to have to go through all the trouble of making a late model master cylinder mount on my firewall, when it already had the holes for putting the 92 bolt-on type master cylinder in. So I got an old 92 master from a junkyard and measured the ID and found out the throw, and found out the diameter matched the newer style ( the diamond shape twist-in) precisely, and the throw on the 92 was about 1/8” longer. So I put it in, after getting the pedal assembly in. Then I got a braided hose and a 4AN adapter from McCleods, put that in, and started bleeding. That took a while, I think because I had the front of the truck lower than the rear. After I got the front higher, and after some old fashioned brake bleeding technique, it finally worked, and perfectly. It engages and disengages half way, just where you want it. BTW I also used the pushrod that came with the 92 master. My only regret is not having used a new master.