Well to conclude, that Driveline unit I ordered from eBay worked just fine. I'd recommend it if anyone else has this problem. The only minor downer is that it took until now to receive it (looks like it was drop-shipped from the mfg. in TW). But, no biggie.

But man, I'd never removed a factory-installed ring before, it took me a whole bunch of time and some serious muscle to get the ring screws off, they were on there like they were welded. Next time, I'm taking it to the LBS mechanic and will tip him well, it's some effort.
Thanks to all for the advice!