Amazon.com: Sliding Patio Door Rollers 1-1/4 Inch Sliding Door Tandem Roller Assembly Sliding Glass Door Rollers Replacement Sliding Door Wheel Replacement, for Sliding Glass Door Screen Door Gate Window (2 Pack) :
CRL G3146 Sliding Window Roller with 7/16" Nylon Wheel for Milgard Windows - Pair - Walmart.com
Changing Sliding Window Roller - YouTube
Nylon Window and Door Roller Wheel Assembly Parts | BiltBest Window Parts