If it's description as advertised is correct, then I'm sorry to say it is not a Plunger hub- and you will still need the dust cover (which answer above '?', is two bits spot-welded together- as I already said).
It will (should) work if you use the bearing spacer from the hub you already have(assuming it's a Plunger one), but won't have a R/H bearing retainer ring, and back to the original confusion- is it left or right hand thread. ..(?)
They at least use same bearings .
Plunger hub # is 67-6126 dust cover 67-6128.
You bought a 68-6114 (?)