I have a 01 4.7 automatic Dakota Quad cab 4x4. Currently I have a 52028816AC leaking at the seams. I notice from reading online that this is a single core? If so, is it possible to get something bigger and still fit in the stock mounting area without modding it?

 

Here you go.
This is the one I've been running for years. It is single core, but 1.63" thick. Discussed in the related thread below....

 

I'm ordering mine this morning. I found a place cheaper than Amazon though. Auto Parts Warehouse has it for $63 and free shipping. I was going to buy it from Amazon but then saw that was going to take one to two months to get! From autopartswarehouse it was just going to take one day to ship.