I have a '49 3100 and I'm to the point of purchasing a firewall pad.The three vendors that I've been using each sell a different type.One is rubber backed,one is plastic backed and one is fiberglass backed.I would appreciate any advice or opinions on these before I buy.Also I assume this needs to be installed before I run a new wiring harness and install the heater?Thanks for any help,Chip Watford Calhoun,Ga.
