Thank you for providing the pictures. The Fan-Tastic Vent Replacement Lift Arm for Roof Vents with Flat Lids item # FVK8014-05 replaces the flat roof vent arm on Fan-Tastic Vents. If you have a Domed shape Fan-Tastic vent you will need the Replacement Lift Arm for Fan-Tastic Vent Roof Vents item # FVK8011-05. view full answer...