I just did this on the 2010 Cummins two days ago. I have access to NAPA, Interstate, Tractor Supply, and some off the wall house brand that a local parts store handles. Any other option is $40 worth of fuel away. I couldn't find the size for the diesel at TSC, I wasn't going with the off-the-wall version as it was $190 out the door, and the Interstate would have been nearly $240 out the door. So I have two new NAPA AGM batteries for the princely sum of $445 out the door for two.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".