I purchased the expensive one from Rick's and ended-up returning it as it was not really close to the OE version. Rick's sources it from a vendor in California (I tried to find the vendor, but can't seem to get a hit). Anyway, the top is more like a rubber sheet and the insulation is very thick with a silver heat shield impregnated between the rubber and the insulation.
There are few other posts regarding the pad - someone purchased a molded pad on eBay from Tamraz's on eBay and applied a molded rubber spray thereafter. Looked very good from the pictures, so that's my plan or attempt to rebuild the original!