trying to confirm my size

Thanks for reaching out to us. We sell a variety of balances, but I'm not sure what you have from these photos. Can you show me a clearer picture of the bottom tip of the balance? Can you also tell me if this is a tilt or non-tilt window? Finally, I can't really read the diameter of your tube from that photo. Can you tell me what it is?

We do not have a store in Dallas, unfortunately. Our business exists online exclusively.

I'm afraid I don't have a phone line. I can only help you here.

This picture is a big help, but I'm still not sure what the diameter of the tube is. It looks pretty large so it may be 9/16". If so, then I recommend the Series 500 spiral balance.

As for other parts you need, that's not something I can say. The Series 500 is compatible with dozens of different parts add-ons depending on who made the window. We would need photos of each part you have now.

Gotcha, in that case you definitely want the S400-27 instead.

I'm not sure what the plastic piece at the bottom of the window might be. It sounds like it could be a mounting bracket, but the S400-27 is compatible with dozens of different kinds. I would need to see it in order to recommend a match.