Wellis, that looks like a legitimate kit, but I don't see how the back side rubber dampers would have any effect since 3 of the 4 bolts thread directly into the support (on my 69 firebird anyway), i.e. no nut is required on the back. It looks like you don't have a Camaro/Firebird, so your core support may be different.
After doing some research and dimensioning, I ordered the following Doorman rubber mounts from Summit:
http://www.summitracing.com/parts/rnb-31016
I will post back once I get everything installed. Hopefully they will hold up to the temperature.
I checked at Home Depot and of course they didn't have anything worth a damn.