Driver Side Nylon Window Track Guide 73 Dodge Dart Sport

The smallest part is driving me crazy. I need to replace this nylon piece that is missing from the window guide. My window flops around when rolled up. I tried to compare it to my passenger side door, but the internal workings are completely different then the driver???
If anybody has restored theirs or have your door panel off could you please give me a picture or tell me which part this is. It look like nylon piece would snap onto the ball shaped end and then connect to the track to hold the window in place. PLEASE HELP!!!

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