pivot lock shoes broken

This is a match for our Series 795 channel balance. If the only thing that broke is the shoe, then you can replace the old ones with the 15-195. Just note that the shoe breaking like this is typically a sign that the balance isn't far behind. Could be a few months, could be a few years. It's hard to say. You may want to consider all new balances now just to get it over with.

The Series 795 balances screw in. I'm actually not familiar with this anchor you're using. The two most popular styles for this balance are clips that screw in and clips that hook in, but this anchor is new to me. Would it be possible to see this out of the window so I can get a clearer look?

There appears to be a screw holding that clip in. That makes me think our Series 795 will work as-is, but I'm still not entirely familiar with this design so I can't be 100% sure. I've just never seen a screw clip shaped like this before. 

As for the shoe, your original didn't appear to be indented. I wonder if your balances are mixed between indented and non-indented. Either way, you can use our 15-236 for the indented shoes, but you still want to use the Series 795 for the whole balance.