Mine are Bosch 80010 type, $8 from Rock Auto.
A guy on one of the truck forums wondered about the 'self regulating', so he left a duraterm going for 36 hours until he had to leave the house unattended, and it didn't burn out.
Early cars had slow plugs (and matched controller). Later, and many service replacements got the fast plugs.
Slow is like 2 minutes form freezing, fast about 30 seconds. Mostly the fast ones have a tapered tip.
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