Is this the right door window run for my 87?

[bennylava]

Hi all. 87 silverado, the passenger side power window is going up and down slowly. Very slowly. I have already replaced the window motor and regulator with new AC Delco parts. So I was surprised to see that it was still slow. I've also replaced the felts that you rest your arm on if the window is down.

But I have not replaced the felt that runs up to the top of the door, and down inside the door. I believe that may be causing the window to be slow. Is this the part that I need?

https://www.ebay.com/itm/392883163313