My all time favorite was a cordless impact that I dug out of the trash, in Schweinfurt. With case and two batteries to go along with it. Made by Dewalt, (I believe Dewalt was bought by Bosch?) it is long out of production. But what a great tool.
The TM tells you to replace the lock washers anyway, and we found that often, the Bolts were over tightened also. It was just cheap insurance for us. It also give torque spec's in the MEP-804A book, so you should use a torque wrench.
Back in 1991-1992, for the MEP-004A, I sent a bunch of bolts to TACOM, Troop Support Command, (Long gone to be replaced by CECOM) and they sent them to the lab. Most if not all were at least slightly over tightened. Everyone just HAS TO make it, that little bit tighter. It just made sense to me to change both.
One reason we always, took the WHOLE package, (main gen hooked to engine) out of the gen housing is simply easier to work on it. And we found that we had less damage to the set that way. And we found it was easier to mate the two up, outside the set.
Most folks do not do that, but we learned if you want fast, it had to be done smart. We changed over 40 gen sets main seals, front and rear in two months. Its the same amount of work to pull it out for seals, or a main gen. I will admit, I had two Thugs, that could pull the pack out in about 3 hours, start to finish. And it was not a hack job. They only had the tools that they knew they needed, and unhook the stuff that the knew had to be unhooked. The only "extra" work was draining the coolant.
The MEP-804A TM tells you to separate the pack in the set. If its your first time, do it that way. And hope you never have to do it again. Its not hard, nor rocket science. We had a bit of experience, that most folks in the forum will never see. My Thugs to rip it out. One crew to do the repair. And my Thugs to put it back in. Poetry in motion.
I cant help you on where to buy fasteners. I live on the wrong side of the big water.