Little piece that connects to slides at bottom of window.

Hey, Toby. This part is known as a pivot bar. We carry a wide variety, so I'm confident we can find a match for you. One part to start with is our 26-021. I recommend carefully going over our dimensions to confirm that this is a match. The most important measurement is the distance between the installation hole and the outermost tip of the bar; it's very important that you make sure this measurement matches yours. For the 26-021, this measurement is 1-3/8".

Thanks! I still think the 26-021 is our best looking match. Carefully go over the dimensions we show to confirm. Hole placement is important.