Rubber mats for tool boxes would work. Or if you have any old car floor mats you can cut to fit. Tool box mats should be available at TSC, Sears, Lowes etc.
"As I stated before, diesels do not produce enough CO to worry about, but they extrude loads of NOx and that my friend is caustic, poisonious, noxious, and did I say poisonous if it is absorbed by your lung tissue and gets into your bloodstream."
As I said before, I wouldn't worry about what it is, just eliminate it it.
Here you go. No batteries, or batteries or 12v lighter plug. I don't think CO is the problem though. See above technical reasons. If it was you would have had the problem this winter.
i threw the doors on today and turned it on and drove around the yard for about 15 minutes and i started to get a headache. (maybe it was just me getting worryed about getting sick again) But i was driving it yesterday with the doors off and i was fine so its something to do with the fumes.
And i think SkyPup is really onto something on what it is. He seems to really know his stuff
Here is a link to some good information on Diesel emissions. It also has exposure limits to the different constituents listed. CO, NO, NO2 and SO2 are all hazardous to your health.