Pella 8' patio door

Thanks for writing in. Pella uses a few different patio door rollers in their sliding doors, so I'm afraid I can't say for sure what you need based off this information alone. The 81-098, 81-244, and 81-249 are all common Pella rollers. Start by comparing them to your old hardware to see one matches. Specifically, patio door rollers are distinguished by their overall appearance, as well as the width and height of the housing and diameter of the wheel itself. If none of these options are what you need, give us those measurements and a picture of your old roller out of the door, and we'll try and find something for you.