Quick question for y'all. I don't normally plug my truck in during the winter because since I've owned my Cummins, it hasn't really gotten too cold. We've been having mild winters here. This year is a different story, it's been around 0 every night, and only getting into the single digits to low teens during the day. I haven't had any problems starting it yet, but it does start right into high idle. And it doesn't look like it's going to warm up anytime soon. My truck has the grid heater, but no cord. Dealer can get it for like $100 bucks which I thought was dumb but what do I know. I found a set up on geno's garage for like $15. I haven't looked at the plug in on the heater yet, but my question is, are they all the same? The one they have on there says it fits from 89-14 for both 5.9 and 6.7. I went to Napa, Auto Zone, and Advanced Auto today, and they all looked at me like I was retarted for asking if they could get the cord. So I'm gonnna have to order online, just want to make sure it's the right one before spending money. Thanks for any input y'all.

'89-'14 Dodge Cummins Engine Block Heater Cable-Geno's Garage