Dave Sr. from SWISCO responded:
June 1, 2017
The only way to determine which roller you need is to remove your existing one from the door. I think it could be either the 81-249 generic roller or the genuine Pella 81-098 roller. These are for the older Pella doors. We also carry the 81-244 for the newer style doors. However I'm not sure which one of these will fit your door. That's about as far as I can narrow it down without seeing the original out of the door.
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