I replaced the upper rollers last year and found the exact replacement “trucks” from Boat Outfitters. These rollers are available in three sizes. I first removed the shroud to access the door and loosened the upper track to identify what roller was needed. The wheels on mine has totally deteriorated . The mechanical repairs were straightforward however cleaning all the caulk and re- caulking was tedious.
I replaced the upper rollers last year and found the exact replacement “trucks” from Boat Outfitters. These rollers are available in three sizes. I first removed the shroud to access the door and loosened the upper track to identify what roller was needed. The wheels on mine has totally deteriorated . The mechanical repairs were straightforward however cleaning all the caulk and re- caulking was tedious.