Hayden and B&M both make a stacked plate cooler. They probably sell Hayden, thats why they recommend them. They are probably equal in quality.
As for the kevlar od band, they are trying to get you into the shop for a rebuild.
If you want a real transmission, have dennis send you one.
For the mean time, just keep clean fluid in yours (change it every year), and avoid wide open throttle 3-overdrive shifts.