You appear to have the older style pivot shoes, which are now replaced with our 15-015
As for installation, you should have cut-outs to remove the shoes behind the window stops at the top and the bottom of the main frame. If you have to make cuts outs yourself, only make them behind the stops or in a spot where it will not effect the operation of the window. You will also have to disconnect the balance from the pivot shoe with a 75-006
Spiral balance Charging Tool. You will be able to find directions on how to do so on our Adjust Tilt Window Spiral Balance Guide.