Sliding Door Rollers

These rollers came off of sliding patio doors in a condo in North Myrtle Beach, doors in which lead to a balcony on a second floor that gets riddled with wind, salt water, sand, moisture, improper care, etc.

A few of the other rollers crumbled as we removed them, as did the bottom of the sliding patio doors, which left holes in the frame of the patio doors. Any idea what is the brand of the patio doors? Its not the typical vinyl, its aluminum or metal otherwise, it wouldn't have corroded the way it did.

Attached are pictures of the rollers, as well as pictures of the sliding door. We just want to try to identify the correct rollers and the door manufacturers. This is for a customer of mine that I am working on some minor renovations but the sliding doors werent sliding due to the wheels, and she cant afford new doors at the moment. Thank you for your help.