Exact fit in 500 set
Perfect fit in my ringerless 1972 500 set. Only challenge was figuring out the faded color coding on the fabric covered wires, but The Internet (as always) had the answers: http://www.classicrotaryphones.com/forum/index.php?topic=15870.0 Ringing just like it's supposed to. Wire lengths "perfect"...as one might expect :-)