tilt window latch

Home built in 1990's. No serial number or manufacturer information on the windows. All of the Tilt Latches have broken. They measure 3-1/2" long x 7/8" wide. 5/16" high. Space from screw to screw is 2-5/8". I really need to replace these or I have to replace all of my windows. Hope you can help!

Hannah