Anyways, I had enough of dealing with that, but went and got a new ground strap and cleaned the old one and the screws and bolts. Then I started taking apart and cleaning my mini starter. That rebuild kit is good for the brushes, but not much else. The nuts provided in the kit are too big and the one of the bolts is shorter than the original one. I couldn't find any good photos or directions online, so if someone else is doing this, I hope this helps.
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The shorter bolt came in handy for the relocation adapter thing. The smaller stud however is too long to get the cover (in the photo sitting on top of the starter behind) on there. I might cut it off with a dremel. On the other hand, I guess the cover might not be 100% necessary.
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Here you can see the original bolts. The taller one goes on the battery side. I hope not having the those grooves on the bottom will not cause any issues.
Now I'm gonna see if a better ground is going to fix my stalling/ non-starting issue...