I used to buy a standard 14x14 spacer but it didn't fit my old Coleman Mach AC so I ordered it and it fit like the original. Looks like foam rubber is a good material.
Efficient Camco RV Roof Vent Cover: Optimal Air Ventilation for Your RV, Rain or Shine
9 Review
RV Roof Vent Fan - Hike Crew 14, 12V 6-Speed Motorhome Fan with Remote, Auto Temperature Control, Intake & Exhaust, Rain Sensor, Electric Open/Close, Smoked Lid - Includes Screws & Garnish
9 Review
π Ultra Breeze Vent Cover - White Translucent for Fan-Tastic Vent U1500WH
9 Review
π₯ Dometic 3314998.000 RV Air Conditioner Replacement Part (Non-Ducted Heat Strip): Enhanced Cooling and Heating Efficiency for Your RV!
9 Review
Protect Your RV With LATCH.IT Shade: 7'X9' Zippered Screen Awning For Ultimate Wind Protection And Privacy.
15 Review
Keep Your RV Clean And Safe With LATCH.IT RV Step Covers - 3 Pack, 22" Wide, Best Fits 8-11" Deep RV Stairs - Protect Your Radius Steps Today!
21 Review
3 Pack 18" LATCH.IT RV Step Covers For Camper And RV Stairs - Fits 8-11" Depths - Keep Your RV Clean With Step Rugs
17 Review
12V DC Electric Trailer Jack - 2000Lb Lift Capacity With Hard-Wire Connection
12 Review