Citation Patio Door Rollers

Please help me determine which replacement rollers I need to purchase.
Also let me know if there are other parts besides the two bottom rollers you would recommend replacing at the same time.
I also noticed on your installation video that the sliding door was on the inside of the house and the stationary door was on the outside track. Mine are opposite... is this something I should correct (assuming this is possible)?
Thanks,
Bob

Swapping the position of the slider and stationary is almost always impossible. Usually the stationary is held tightly in the frame and the slider would not slide there even if there was a rail for it to run on.