As you may know, my red porsche calipers are not the best there is. Also, I'm not satisfied with wheel spacers which I needed to use to fit 16" wheels. Current setup is machined Alfa Romeo 166 V6 discs (310x28) and 996 porsche GT3 rear calipers. Yes rear, so technically they are porsche 996 monoblocks, however I cannot call them so, because true 996 monoblocks are 996 NA front calipers :). I have them also, however was reluctant to fit, because it requires master brake cylinder replacement. Red setup is fine, fade resistant, however it does require to have hard foot. And I don't have one :(. To improve my speeds at the track, I need to focus on driving, not on braking. So black brake upgrade is under way. Also redrilled volvo S60 disks (305x28 directionaly vented BTW) will be used. This should fit 16" wheel without spacers (or with tiny one, not 2.5cm, like it is now).First measured all the distances, cut some templates from cardboard. Everything fits ok:
Then ordered batch of carriers at local machine shop. Design has some minor flaws (due to dramatic increases in machining price, I was forced to change initial design a bit), however virtual testing on computer shows, that those design flaws should not affect service of the carrier. BTW, this is for racing use only, not for everyday street application (lowest FOS is around 4, for street you may need something around 10)
Test mount on my rusty spare suspension leg. Fits like it should:
Volvo disk fits ok, however after it is getting some surface rust, temperature expansion - it will scratch suspension leg. Notice line of rust on the brake disk. That's scratching on the bearing play. Leg will need some modification (shaving few mm) at one place, which looks some manufacturing option - place for thead when using larger brakes. Also lower ball joint is too close to the disc. Compromises, compromises... Hope I will solve them.
Will see how it will perform overall. First painting, then master cyl. replacement to 20v one, and after that I hope I will have real racing brakes ;).
Ordinary tools failed to deal with this. Some bigger caliber was needed. 
China made tool (red one) failed immediatelly. 
However russian steel, some propane torch magic and lots of not so nice language made it. I was not suprised to find, that both shocks were different. One is from Opel, another is "import part". No idea what it is.
Here is final result:
Then ordered batch of carriers at local machine shop. Design has some minor flaws (due to dramatic increases in machining price, I was forced to change initial design a bit), however virtual testing on computer shows, that those design flaws should not affect service of the carrier. BTW, this is for racing use only, not for everyday street application (lowest FOS is around 4, for street you may need something around 10)
Test mount on my rusty spare suspension leg. Fits like it should:
Volvo disk fits ok, however after it is getting some surface rust, temperature expansion - it will scratch suspension leg. Notice line of rust on the brake disk. That's scratching on the bearing play. Leg will need some modification (shaving few mm) at one place, which looks some manufacturing option - place for thead when using larger brakes. Also lower ball joint is too close to the disc. Compromises, compromises... Hope I will solve them.
Time will show, what will be the result.
You can clearly see, that those 4x4 mounts are solid rubber. Russian made things sometimes last very very well, no matter how crude they are made :). The problem is, that the thread is using M10x1.25 pitch (normal mounts use conventional M10, which is 1.5). Also mount heigh, if I want to put it in the old "cup", is almost twice shorter than needed. Will need to think some strong and elegant solution (it will turn to be weak and horrible to make - as usual :D).
