trying to find replacement pins for 20 year old Peachtree Window screens

Thanks for posting! The pins typically used along with the 70-208 screen latch set are parts 70-008 (7/32" diameter) or 70-009 (5/32"  diameter). 

To confirm which plunger you need for your screen, you'll need to compare the measurement for the length and diameter of the pin top; the most important distinction being the diamter. Take a look at the dimensions below.

Alternate image for 70-008

Alternate image for 70-009