i found this in wiki it looks like they may not be enginearable in australia because of their dust seals

Wilwood Dynalite Calipers on 280zx Struts
Perhaps the most effective braking system you can get on a 1200 / 120Y / B-210 etc... ( at least as good as the FIA brakes at a much lower cost. ) It's an upgrade that will last the life of the vehicle.

This upgrade requires all the work done to swap in the 280zx struts in addition to a custom caliper adapter.

Some people have mentioned that some Wilwood calipers do not have dust seals and as such may not be road worthy in some places ( Australia for one! ) I've been looking for an answer to that question. Dynalite calipers don't have dust seals and allegedly don't need them, Dynapro calipers MAY have dust seals, but I can't verify that.

[edit]Benefits:
1. Significantly lighter than 280zx calipers. ( any unsprung weight savings are good on those heavy strut assemblies )
2. 4 pistons
3. Wide range of pads from street to severe duty race pads without spending any more than regular pads.
4. Many people consider the Wilwood caliper to be more reliable than the OEM calipers, not needing rebuilds for years.
5. No machining of brake disks to fit them. Once you have them installed all service parts are regular off the shelve parts.
[edit]Disadvantages:
1. Lack of dust seals may be a problem if you need to get upgrades engineered.
2. If used on a track car, you'll be put in a class with much more powerful cars.
3. 14" or larger wheels needed.
Some wheels may require spacers, 14" 280zx and 280zx Turbo wheels have a different offset, so non-turbo wheels may not need spacers.
280zx Turbo wheels may also need a little bit of grinding to clear the caliper, and even then the space between the caliper and wheel spokes may be extremely small, also the nut that holds the caliper to the adapter will have a very small amount of clearance to the brake disk.
4. Installation will require removing splash guards from disks, which may cause problems if the upgrade needs to be engineered.



[edit]Installation Notes:
Installation of these calipers is fairly easy. You need to source an adapter to attach the brakes to 280zx struts, look around on 280ZX sites or check ebay. If you're going to this length, you'll want to get some stainless steel flex brake lines, and the proper adapters for them. Also make sure to retain or replace the flex hose support on the strut or you could have engineering issues. The adapter I used in my install required some very thin profile special nuts to attach the caliper to the adapter plate, so keeping a set of spares on hand would be a very good idea.

Service kits are available for a very reasonable price ( about $10 USD )
Adapter plates should run about $100 - 200 USD
Wilwood calipers aren't that expensive... About $130 - 150 USD per caliper vs. $50 USD for an average 280zx caliper. vs $300 USD! for the Nismo MK63 Sumitomo 4 pot caliper.