Sorry, the forums blocked it. I'll copy and paste what was in the link:
The vt booster wont fit without modification but you can fit the vs booster straight in and the vt master will bolt to that.
i found this a while ago should help with the booster/master side of things.
How to adapt the VT Master Cylinder to early model Commodores.
(Required when VT Twin Spot or Nissan 4 Spot Brakes are fitted.)
The principle behind this is that the standard 1" master and booster from the early V8 and turbo models give a less then satisfactory pedal feel and stopping power. Using the below parts, you can achieve a massive improvement in braking power with less pedal effort required.
It is highly recommended on the VT Twin Spot Caliper Upgrade and also the Nissan 4 Spot Caliper Upgrades.
It is more or less a straight forward bolt up proposition, with just a few small, but important modifications.
To do the following upgrade you will need the following.
+ VT Master Cylinder ($75 from wreckers)
+ VS Plastic Brake Booster from V6 models only ($75 from wreckers)
+ VS Master Cylinder Reservoir (purchase new from Holden about $10) (Part No. GM-VS21166)
+ 3 Brake line Adapters (Available from Cebco for under $50 delivered) (Only required on pre VR models)
+ Dot 4 or equivalent Brake Fluid
Step 1.
On the V6 VS plastic booster, unscrew the adjustable bolt in the end of the pushrod.
Step 2.
Cut the head from the adjustable bolt you just removed and put a small slit into the end of it with a hack saw, so you can use a straight blade screwdriver to screw it back into the pushrod on the booster.
Note: You must cut the head of the adjustable bolt short enough so it can become level with the pushrod on the booster.
Step 3.
Screw the bolt back into the pushrod and use locktite to lock the thread on it.
Note: Make sure its 100% level with the pushrod itself. The only reason we screw the bolt back into the pushrod is to stop the hollow push rod from collapsing, it may fatigue over time from it being hollow. The bolt will strengthen it. So please don't just leave it out.
Step 4.
Remove the VT Master Cylinder Reservoir with the small bolt on the side and fit the brand new VS Reservoir.
Note: If your careful the seals in the bottom of the master cylinder will be fine and you can just push the VS reservoir into place without replacing the seals. We fit the VS reservoir so it sits level and can be filled properly, the VT item sits on an angle and prevents the master from holding the proper volume of fluid when used on early model commodores.
Step 5.
Screw in the line adapters with the copper washers supplied and torque up firmly.
Step 6.
Bolt the VT master cylinder to the VS booster.
Step 7.
Now you can bolt it into the car the same way as your removed your old setup and bleed the brakes, starting from the Rear Left, Rear Right, Front Left and finally Front Right.
Note: The emergency brake light connector will plug straight on to the VT master cylinder.
If you followed the above you should have achieved a greatly improved pedal feel and improved braking power.
It is amazing how even the single diaphragm V6 VS unit give more power and assistance then the highly overrated double diaphragm steel unit from the early model V8 and Turbo vehicles.
Article put together by RB30-POWER from calais turbo.com in 2005
You also may have to get specific lines to run from the early fixed line to the later calipers as the flares are different. Where you got the hubs from should be able to help there, while your at it you may aswell upgrade to braided line to give even better pedal feel.
