Where to buy window track felt

Yes, I know, I had to buy them by the pair ($120ish)a coupla years ago, was surprised at the single price, but they explain why.
I still have the remaining single on a shelf.
Good job Detroit Muscle !
I am actually looking for the felt piece that goes down inside of the actual door. But when I just went out to the car I realized I also do not have these pieces. ole Dart is coming for my paycheck again!