M/T Radiators cost more than A/T?

Looking at Year One to get a new radiator and see that M/T radiators cost ~$45 more than A/T (both 22" and 26"). I'd think that M/T would be cheaper as there are fewer parts. Am I missing something?
If you're not worried about being 100 percent correct, get the cheaper auto radiator and then go to your local auto parts or hardware store and get the brass pipe plugs and plug the auto holes up. Problem solved