Depending on what model you have will determine if the rack fits. If it's a C model rack it won't fit the D models as they have slight differences in the arse end.
As for hard luggage, I have nothing but praise for the Hepco and Becker top box and panniers I have fitted to the Rex. It's like the tardis now!! Swallows heaps of gear and then does interstellar travel!! The Hepco & Becker stuff is simple to fit and hasn't given me a moments problem since I put them on 18 months ago. I've probably done 20,000 klms with them fitted and they work really well, are easy to load, easy to unload and carry as much as I need for a long trip. I can pack my laptop, suits, casual gear etc and go away for two weeks comfortably.
I got them from the Aus Distributor who is in QLD i think from memory. I just googled Hepco and Becker and up it came!

"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me" Hunter S. Thompson.
There are really only two questions in life. 1.Which way do i go? 2.What is the lap record?