I thought my experience in obtaining OEM hard luggage might be informative/useful for others, because things have apparently changed over the years since the bags were in production.
When I bought my '07 Anniversary Interceptor a little over a month ago, I knew I wanted hard bags. I was unsuccessful in locating an Anniversary RWB bike with OEM Honda bags, so once I got it home, I started researching. I pretty quickly decided that I wanted the OEM Honda bags... even though they are basically Givi bags, the mounting brackets tuck them in better, and shape integrates better with the bike.
Option #1 was to look for used bags (eBay, etc), but I couldn't find anything, so I started researching part numbers. I was able to find the part numbers for the brackets and bags pretty easily, and discovered that there were originally two separate part numbers for the brackets (side mounts and center brace) and additional part numbers for the bags. I was able to track down the center brace on eBay, and found what I believe to be the last set of side brackets in the US at a dealership in Ohio. I was also able to order the bags new from Honda, and was told at the time I got one of seven sets of blue bags left in the US.
Side brackets: 08L41-MCW-1000W
Center brace: 08L41-MCW-800B (number no longer in Honda's system)
Blue bags: 08L41-MCW-1E0
To my great surprise, the bags purchased under the part number above included all the mounting brackets! None of my research had indicated that would be the case, but then again, almost all the threads I found on the subject were at least 10 years old... All in, it's not a bad deal, and only about $200 more than buying the current production bags and brackets from GIVI (not including my extra brackets... LOL).
TLDR: there are still some OEM bags out there, and the blue ones, at least, come with the mounting brackets.
On to the rest of the story...
When I started installing the mounting brackets it was immediately apparent that they were not going to fit with my Delkevic exhaust. The mounting arm that bolts to the center bracket behind the license plate is angled to match the triangular OEM muffler and wouldn't clear the oval aftermarket muffler.
I am fortunate enough to have the ability and tools to do some fabrication, so I cut off the offending mounting arm, and modified the center brace so the stay would be horizontal instead of angled, and thus clear the muffler. Then I welded everything back together.
The rest of the mounting procedure was easy bolt-up, per the instructions.