Turns out that coaster brake hub was spaced for 120mm dropouts with a 150mm axel. My Surlys are 135mm. That's pretty funny if you understand dropout spacing. If you don't, here's a joke.
Two guys walk in to a bar. The third one ducked.
I am the alpha and the omega of comedy. All SRAM coaster brake hubs in the US are sold out through summer, so I'm eying one of these fellas. Next week is bike to work week!