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Why would you want a heater on the oil cooler? Read this article from AOPA Pilot magazine. Check out the photo on the second page ... the oil cooler that was blown apart by excessive oil pressure due to insufficient preheating.
Also read this info by Pacific Oil Cooler Service discussing the need to preheat the oil cooler as well as the engine, and what happens when you don't.
If you allow enough preheating time (overnight) a heating element on the oil cooler is not needed because everything in the engine compartment will be heated through conduction and convection (assuming the cowl is sealed and insulated with a blanket). However, if you are the type of user who will plug the preheat system in for just a short time, especially in very cold conditions, then adding a heating element to the oil cooler is a good idea to help avoid the problems described in the above articles.