One of the most common Patio door rollers for vinyl sliding doors.
Used by Milgard, Weather Shield, Keller and many others
This Sliding Patio Door Roller has two 1-1/4 inch (31.8 millimeter) diameter Steel ball bearing or Nylon rollers. 
The steel housing assembly is 11/16 inches (17.5 millimeters) wide and 1-5/16 inch (33.3 millimeters) tall. 
This unit is used by Phillips and other door manufacturers. 
There is another roller ( 13261) with a 1" tall housing that looks like this one. 

Housing Tab Style: Unique housing

Roller Diameter: 1-1/4-inch

Housing Height: 1-9/32 inch

Housing Width: 11/16 inch

Roller Edge Type: Concave

Roller Material: Nylon

Installation Screw: 1/4-20 Machine Thread

Includes one roller assembly, Sold each, priced each.

Related items: 
13261 - Keller 1 inch tall housing 
13262 - Phillips 870 Marquee with 1-5/16 tall housing