http://www.mcmaster.com/#heat-tape/=7lkciq

go to the second to last item on the page. DC voltage, flexable silicone rubber heat strips.

DC voltage is ideal for mobile and laboratory applications running on battery power. They work on metal and plastic tanks and have adhesive backing for sticking to very clean surfaces. Watt density is 5 watts/sq. in. They have 1-ft. wire leads for hardwiring. Max. heat output is 300° F. Exposure temperature range is -40° to +300° F.
Please specify 12 VDC or 24 VDC. I use a 7ah sealed battery in summer time will take engine to 200 in about 8 to 10 min check temp under cooling heat at cylinder do not let it get to hot.

1" x 5" is the one to use for 25.92$


note that i do not have one of these. I have this website and information from another poster on this site. And i have it saved because i plan on using it. Looks just dandy!!!