Replacement window sash brackets

Although there are no markings, stickers or stampings on these replacement windows we believe that they are app. 17 years old and possibly manufactured by Silverline. The clips are held to the bottom of the sash with two screws and then lock into the balance by tipping the sash. It locks into place when you swing the window up into position. I am in need of several of these clips.
Thank You,
Duane

Perfect match Paul....... Thanks for your help