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I believe clutch size is based on the diameter of the disk. I just measured mine and it's ~9". The pressure plate diameter is ~9.5".

The balancer just drives on. Use something to support the rear of the crankshaft and a piece of hardwood and a large hammer. You'll feel/hear it when it's home. Put some sealant in the key slot so that doesn't leak (probably overkill, but since you already have it off, it can't hurt.) There's nothing but friction keeping it in place. Later engines used a bolt in the center of the crank.