Lower Sash Block

Is the lower window sash block mounted onto the upper corners of the sash to catch the top end of the balance? If not what is that component called?

Sir/Ma'am:I'm trying to purchase and replace two window non-tilt balances and I just needed a bit of help ID'ing some parts and confirming what I need. The balances themselves measure 27" for the metal and are marked 2630, looking at them I am fairly certain that I need either S380 or S385 to repla ... (cont.)

Hello! I need to get the attached replacement part for these windows. I just bought a property and some of the windows are damaged. Also, do you know what brand Windows these are? Found you online and was happy to see you were not only in NJ but in Camden. The property is in atco and windows are f ... (cont.)