There is a set of these off a 79 blazer in a local salvage yard. The tracks are dirty and the window hardly slides. The plastic locks are broken. The rubber around them looks like it won't last the removal then installation. The wing windows rotate. These are untinted. They want 50.00 each. I haven't checked if they are even the same size as my windows. I currently have one piece windows with nothing wrong with them. Are vented windows worth getting? 73 Blazer in So. Ca.