I have good news and bad news for 1st gen owners:
Bad news first: These brackets do not work on a 1st gen as is, and they don't work with FZ1 mirrors as is.
The shape of the bottom of the mirrors are not even close to the same. The studs on a 2nd gen are offset towards the top and the studs on the 1st gen and FZ1 mirrors are centered. FZ1 mirror base (stock 1st gens are very similar)
And with the rubber boot pulled back
And where it mounts to
That means that the relieved area in the new aux light bracket that the 2nd gen mirror base fits into is not aligned right for a 1st gen mirror.
I was able to hog out the two holes and relieve some of the original raised part of the bracket with a Dremel to accommodate the one square corner of the mirror base, (making a complete mess of Dave's beautiful machine work, but hey... this is a proof of concept test!) and thereby get the mirror base to sit down into that relieved area, but then there is no way to tuck the rubber boot underneath.
The boot could just be slid down into position, but honestly it still doesn't look all that good, and the boot could slide up.at any time.
I think that for the 1st gens, there is no need to have a relieved area for the mirror base at all. Just make it completely flat at the thickness of what was the relieved area on these brackets.. A flat bracket may actually work universally fine for 2nd gens too.
What I've done (wish I'd have thought of this before ruining the pilot test bracket) was to make a template from cardboard with two holes for the mounting studs and trace the outside of the mirror base onto it so that Dave can fab up some FZ1 mirror compatible brackets.
As you can see I just left the bottom a rough square shape. Dave can jazz them up however he sees fit down there.
I'll be sending the cardboard template to him on Monday.