White nylon multipoint lock keeper.
Right hand shown.

Measurements:
Length: 1-13/16 inch
Width: 5/8 inch
Height: 7/16 inch
Thickness

Related Parts:
556089 - Left Hand Keeper

Handed: Yes, Left & Right as Shown 
Material: Nylon (plastic ) 
Color: White 

Markings: Manufacturer part number stamped may be stamped on back (underside)
The best way to determine which one you need is the number stamped on the bottom or leg length. 

Related Parts:
556084 - .228 Thick, Flat Bottom RH
556085 - .228 Thick, Flat Bottom LH
556086 - .278 Thick, 1/16" Legs RH
556087 - .278 Thick, 1/16" Legs LH
556088 - .331 Thick, 1/8" Legs RH
556089 - .331 Thick, 1/8" Legs LH
556090 - .371 Thick, 5/32" Legs RH
556091 - .371 Thick, 5/32" Legs LH