Help finding the right pivot bar

Hi, I am replacing some windows for me and replacing other in the condo complex. One of my windows has a rusted out pivot bar. I pulled the rusted part out of the pivot shoe.so the pivot shoe is fine. Unfortunately I flipped the window to put out the good one and took out the screw. The good pivot bar fell into the window when I looked the screw. I want to take the windows apart to get that pivot bar back and probably clean out the rusted pivot bar on the other side. I saw the video on how to take the top of the window apart. Wood, hammer and pop it loose. Again, I want to do this for the bottom of the window to get the pivot bar and clean out the rusted pivot bar on other side.