If you need the 5” ones for the attic vents you will probably have to get them through your dealership or any Montana dealership. If they are the small ones for the sewer vents you should be able to get them at most any RV store.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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