I replaced the coolant overflow tank this morning. The new Dorman tank from Autozone fitted perfectly.
I disconnected two of the small leads from the battery power distribution (two small leads that run between the battery and the tank) which provides just enough clearance. The battery does not have to be removed.
To drain the coolant I used a length of 1/4" tygon tube that I pushed down into the large hose from inside the tank. I then syphoned the contents of the tank into a jug.
I spilled about a tablespoon of coolant.. Not bad..
Took about 30 minutes for the whole job and the only tool was an 8mm socket for the power lead terminals.
I loosened the vent plug at the radiator to bleed any trapped air but the system did not have any air in it.
Note, the end of the 5/16ths hose connection at the top of the old tank snapped off inside the hose as I was removing it. Its pretty clear the old tank was on its way out at 116,000 miles.
Anyway for $28 it was a worthwhile precaution.