Hi John,
To my knowledge this product is what Newell coach originally used and can be purchased from them by calling Newell Parts or by using the link below. Same product different source. I do recommend that you give Newell a call just to verify this is the correct insulation.
Sean
Price is 68.00 per sheet.
Heavy Duty Insulation for engine and generator bays.
Size: 24" X 54"
Description: POLYTECH® RAF Foil Facing is an aluminum foil facing reinforced with a glass fiber and thermally fused to an aluminized backing. It is highly stable in severe environments and extremely flame resistant.
Temperature Range: -40°F to +300°F
Polydamp Acoustical Barrier, is a noise barrier composite consisting of an absorber foam with a film face, a barrier layer of filled vinyl and, a foam decoupler layer.
Sound Absorption: FREQUENCY(Hz) 125 250 500 1000 2000 4000 Sound Reduction-db loss: 17 21 26 37 38 47
Must ship oversize UPS carton size 54x24x7
<a href="http://www.amazon.com/gp/product/B0055VTOBA/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative =9325&creativeASIN=B0055VTOBA&linkCode=as2&tag=aff iliatechie-20">050130 Underhood Thermal/Acoustic Liner</a><img src="http://www.assoc-amazon.com/e/ir?t=affiliatechie-20&l=as2&o=1&a=B0055VTOBA" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />
<a href="http://www.amazon.com/gp/product/B004PILLZG/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative =9325&creativeASIN=B004PILLZG&linkCode=as2&tag=aff iliatechie-20">Thermo-Tec 14620 60" X 36" Heat and Sound Suppressor</a><img src="http://www.assoc-amazon.com/e/ir?t=affiliatechie-20&l=as2&o=1&a=B004PILLZG" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />