I moved my Wagner from an 8N to an 860 recently. I faced the same issue, and just called the folks here at yesterdays tractors and explained my situation. They provided the right stuff, I had to buy the spline hub for the crank nose, and also the shaft.
I had to shorten the shaft about 2". You will likely also note that the rear plates which mounts to the fender flange bracket is different. The 860, and I presume the 641 are a longer wheelbase than the 8N. I simply made a pair of new 90deg angle braces for under the fender, to the mount plate on the Wager(vertical plates).
If the 641 front is similar to the 860, don't even try to get the new hub on the crank without removing all the tin, and the radiator. It's a very tight, and awkward fit. If you are able to get the hub in there, getting any of the bolts and locknuts on is nearly impossible. I fiddled with it for 90 min before just taking it all off and working on it with easy access to the front pulley.
Also, if you have power steering pump driven off the crankshaft, you will likely have to get 1/4" longer bolts for the snout. the hub will only allow 2 threads to catch with a double pulley on the front. If you already have a hub on their, you're lucky, and only need the new shaft. Count the splines on the hub before you order it here.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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