I'm not familiar with your set up, if all you need is foam and tape. The big box hardware stores carry this type material. Sounds like you've closed a few gaps before, no different and you'll probably have a better finished product than original. You can also typically find similar or exact replacement material on amazon. I did read somewhere not to use hvac mastic on RV
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Anthony & DW
2001 Ultimate Freedom
Cummins 350 ISC, Spartan MM GT Chasis
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