I would recommend keeping your stock forks and just get a set of race tech springs and gold valve emulators. Makes a world of difference and its probably the cheapest alternative.

Springs run about $100 & valves about $120, new fork seals $15, fork oil $15

Beats trying to go out and buy a set of forks off another bike that you will probably have to end up dong the same thing to anyway.

But if your really determined, early model CBR 900's (I believe) have the same forks diameter (41mm) as the hawk