I take it you're not in Australia then? Well, a AU20c coin is the same size as a 20p coin from the UK so you should be sweet there if you can get your hands on them, they're just a preload spacer. As far as the other options go, you could look at getting yourself some cartridge emulators as well, just don't buy brass ones, brass slivers end up in the fork oil and screw everything up.
Well, the way that a CBR damper works is as a simple orifice damper, so its just got a piston with a few holes drilled in it. Newer bikes on the other hand have a piston with shims on it, which bend out of the way under load to give you "proper" suspension behaviour.
The problem is that an orrifice in a piston gives you damping which goes up to the cube (or something like that) of the oil velocity through the orifice. On the other hand you want a linear oil velocity to damping ratio, so newer pistons have a different design which is a lot more complex... the other alternative is that NSR 250 forks have cartridges which will give you much better body control as well as better and more tunable ride and should bolt right in to the CBR yolks (I think Mootavic has done this mod and liked it).
The NSR250 fork mod is a very good mod. I have done it myself and apart from the bigger forks the bigger brakes are awesome.
You do need to machine some of the length away from the bottom of the head stem under bottom triple clamp, press it through so that it's exactly the same length as the MC22, machine off extra length not needed and re weld.
Sounds complex, but it's an easy job. You also have to cut away the stops and re weld to a new spot so they work.
You get to use your front wheel, guard and all the switch gear that you used before.
You'll need the NSR brake system and the clip ons.
If you can get a front end cheap, then it's a great mod.
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