Went in for the 600 mile service today, and while I was surfing the gear, noticed they had a set of F5's for the 1200 hanging on the wall. I asked if they fit the 800, and Jeff at gateway said he didn't know, but would check. Turns out Fastway didn't know, either, but it just so happens that they have a used 05 1200GS there with Fastways on it (wonder where that came from?)
We pulled one, and the spacing, angle, and pin length was right, so here it is:

And a closeup:
Also picked up a set of Acerbis handguards that had been ordered and not wanted, so, after a bit of fab work, those will go on next. Stay tuned.