Your diagram you link to indicates the part 010067, which would be analagous to the part number 010020 in the following:
http://www.discovolantemoto.co.uk/tarozzi/model-specific-rearsets/honda-rearsets/honda-cb1100f/prod_819.html
One thing that springs to mind is THIS:
http://www.motocicliveloci.it/images/bimota/art.RB18.jpg
Seems like an expensive bit, but pair them up with universal rear-sets like this fellow "Viet" is selling here on the site, and you've got something a lot like tarozzis for probably a lot less. I'd rather bolt up to some point in the middle of the 'K bike's steel triangle than use brackets. Infinitely variable, as YOU pick the holes and off-set. A frigg of a lot easier than doing the supersport plates. Ask me how I know, ha ha.
But could it be possible that you've just confused the parts and how they fit, or rather that they have confused YOU? Ha ha. That would be a quick fix, once you wrap your head around it. Plenty of people have been confused by the things before.
I know how they fit up on the DOHC supersports, here I will see if I can find a link to that. Hmmm, 1100F.net's search function seems to be busted on the new 'F-ormat. That sucks. I'm sure Glenn will sort it out. Still google dug this up, just by way of illustration:
http://www.cb1100f.net/modules.php?name=Forums&file=viewtopic&t=59345
http://img137.imageshack.us/img137/3431/picture0191j.jpg
http://img705.imageshack.us/img705/2403/picture001qa.jpg -Looks a lot like what you've got. Best set-up I've seen (other than my home-made forwar position plates modded to rear-sets, with an approximate position of the RAASK plates) would be Raask plates with Tarozzi bits stuck on 'em. That was cool. But bloody expensive I'd bet.
Also, a link to where I know you can find one form of splined arm. Though I hasten to add, the DOHC CB750F/CB900FCB1100F has two different versions of splined arm, as the "rear-set" type, (Euro/Canadian/NON-U.S. models, and the Hondaline "Sport-Kit" package, for U.S. riders who wanted the Euro set-up) the Sport-kit has a smaller spline, or so I am told. Both forms can be bought and sold on the DOHC forums, you'll find better access to the 'K type on the DOHC customs forum
Anyway, Motocicl Velocci Milano sells a little shifter arm, though I think that Tarozzi was supposed to supply replacement parts for their own crap. The best and cheapest alternative I've heard here, is to find an alloy arm that's broken off and shape that to suit your project. Though you could probably shorten the arm itself, I suspect you'll only have one chance to drill the hole. Still, if you can find more brake levers. Thing is, I'm not aware of a place that sells broken parts. Well, fleabay of course. But I mean parts that are ADVERTIZED as broken. Ha ha. Place a want ad on the DOHC forum classifieds.
http://www.motocicliveloci.it/inglese/catalogue/replicabimota_uk.htm
Or you could go for the expensive thing I mentioned up above, and pair it with the right splined arm and then fit the arm to your system with a bushing, maybe even cut the arm to fit the length. Oh, hey, you've got a drum brake. that should make it a heck of a lot easier to sort out. I was visualizing the way I had to grind down and re-drill my supersport splined pivot, and cut and re-braze the pedal with the end telescoped into the arm, and then re-locate the lower bolt hole for the master cylinder, and make them all fit together. Ugh. Should have done the whole mess in steel and then weld it on. In fact, I intend to do that at some point, basically turn my frame into a fancy version of the 'C frame or 'K frame.
Good luck with it, I hope you'll post up some pics. I'm gonna try and find a pic or two of these babies installed, as I think I've seen 'em once or twice.
-S.
Also, it doesn't have the end link that would be attached to it. 
