As far as the jar goes, the few I've seen still using glass jars have always been plain old mason jars. I doubt this is factory, but given the probability of the jar getting broke in use, I'd think an old Ball mason would be considered a 'period correct' replacement.
On the steerring clutch bolts, there is a torque for them, but it's usually near on to impossible to actually use a torque wrench on them. That said, what I learned from my Dad, who worked at both the CAT and A/C dealerships for years, is that you tighten them as tight as you can using one of the long steering clutch wrenches, or double wrench them, and call it good. If you have any doubts about your ability to get them tight enough, a small drop of red Loctite will usually 'make up the difference'. Dad had done more of them than I can count, and I lost count myself on the ones I've done and we've never had a problem with bolts coming loose with any of them.
As far as the sprocket nuts, again there is a specified torque, but the way I've always seen them tightened was with a wrench that was home made out of plate steel. You put the wrench on the nut, started the machine and rotated the sprocket until the wrench contacted the ground, and then eased into it until it tried to pick the machine up. Once the machine got it as tight as it could, you rotate it into a horizonal position and give it a few good whacks with a large sledge hammer until it stops moving. Granted this isn't as precise as using some sort of torque tool, but in more than 30 years of going into the field with Dad and watching him and others working on equipment, as well as doing it myself when needed, I've never seen it done any other way except in the service books where they have access to $20,000 worth of factory tooling. Ultimately though, I've never seen anyone have any problems with the end result of doing it the ways I've seen it done.