1st gen probe - requires 2 bushings per window, 1 set of 4 bushings.

Do not mix with 2nd gen probe replacement bushings as those are different.

*Shipped direct from manufacturer 

Before installing them to the post, boil a pot of water and once it's boiling turn off the heat and add the bushings to the pot. Let them sit in the water for at least 5 minutes before installing on the posts as lower outdoor temperature (you cold climate people) may cause them to split during the expansion phase.

Installation video