Replacement window parts
We don't have either part, unfortunately. The pivot shoe looks similar to our 15-195 at first glance, but yours has a deep groove in the stem that ours lacks. This groove is designed to fit into a similar groove in the metal channel of the balance itself. Since the 15-195 lacks that groove, it won't fit. The only solution we can recommend is buying an all new Series 795 channel balance.
As for the pivot bar, we also have a couple that are similar but none are exact. Your installation hole pattern is actually pretty unique and nothing we have lines up. With that in mind, I'm going to recommend a couple for you to review. The tips should work in each case, but I'm more concerned about the hole pattern. See our 26-241, 26-360, 26-415, and 26-452. Review the dimensions we show on each products' respective store page to confirm the best match.
1) Could I just use a dremel to add the grove to the pivot shoe?
2) Would all the pivot bars you recommended work with the Series 795 channel balance?
I'm not sure I want to recommend dremmeling into the 15-195 shoe. It's not a solid piece of plastic so you may only end up shattering it. I would advise against it.
The pivot bars I mentioned should all be fully compatible with the Series 795, yes.