So, I completed the service.
To answer my own questions, it was simply upper and lower hoses, a 30 inch 5/8" hose from the cores to the block, and a split hose from the cores to block with an extension to the overflow tank.
There is no radiator neck. There also is no drain plug. Remove the lower hose and drain it.
cut the old heater hose, run a flush from garden hose through it. After flushing for about 10 minutes the water ran clean out the top of the overflow tank.
The hoses were $35 for the split core hose from Advance, and $35 for the radiator hoses combined from Autozone, and about $5 for the 5/8 heater hose.
Swapping the hoses was easy. The split hose has a slide on, clicky fitting that is easy to release by pushing the hose to the connector, and squeezing the flexible plastic release by hand, then pulling off.
There is a thick plastic band to clamp the hose at the core at one end of the heater hose, holding the quick disconnect to the core. I hack-sawed the plastic band clamp to remove it. This allowed me to re-use the quick connect on the new hose, since the new hose lacked this physical interface.
I installed the new hoses, and then used the Airlift 550000 to refill the coolant. All heat worked beautifully immediately.
I highly recommend the airlift tool, as I've done several annoyingly tricky coolant changes in the past, and this one went REALLY well for my first time using the tool and servicing a dual heater core system. It took about 5-10 minutes to refill the coolant system, and I didn't have to f with it.
Hope this helps someone....
Now, can anyone help me with my other post about the tire monitor system and airbag light?