15-015 vs 15-045

Thanks for posting! It's hard to say what you have without knowing your pivot shoe's exact dimensions. What is your shoe's thickness? Also, the 15-015 has a tell-tale notch on the back. Does your shoe have that?

As for the balances, it depends. Are we talking about these sizes being mixed and matched on the same window? Like a 5/8" diameter balance on the left and a 3/8" diameter balance on the right? Or are they uniform per window?

Thanks for posting! If you're not sure, you can take a few pictures of your pivot shoe. That would help us determine what would be closer. Just make sure to remove the pivot shoe fully from the window before you post a picture.

Tube diameter is important. I recommend that you replace everything with what was installed originally. If the windows have worked fine up to now, there's no reason to tamper with it. You can use silicone spray for lubrication.