Greg;

Tim's has a good idea. BTW I found these on Amazon, of all places, with a quick search:

http://www.amazon.com/HyHeet-Graphi...utomotive&qid=1225400313&sr=1-17
http://www.amazon.com/Graphtek-Micr...utomotive&qid=1225400313&sr=1-21

Tim's suggestion is probably more practical for the small amount you need. Good Luck.

Sims