I contacted Pella directly. They told me part number 09ZR0A94. Will this product work as a replacement? Obviously this is not the exact replacement part, but if this works and saves me money.....well.
Bob from SWISCO responded:
September 22, 2020
I can't say for sure, but if we have a replacement for this it's probably going to be either the 58-173 or Pella 58-181. Ultimately you will need to compare the dimensions to see which matches best. That is the one you should go with.