Why not just leave the empty one on the firewall and keep a can of starting fluid in your toolbox? It will work just as well and is cheaper. I am all for authenticity, but no one will know. I had ether start on the HEMTT, but I never even tried it (even though the guy that sold it to me replaced the ether start cannister). I also don't use the pre-heater on the M809 series truck...just give 'em a sniff of starting fluid in the coldest weather (in MD) and they start right up.