Fork Swap Help - 2004 CRF450 onto 1996 CR250

Hi guys,
I picked up a set of '04 CRF450R forks for my 1996 CR250R. They should shim in nicely with coke cans.

I guess Honda changed brake calipers in 2004, so my 1996 front brake won't work.
1. Is there a cheap/simple way to make the existing 96 brake caliper work like a bracket?
2. Can I just buy the front caliper and use my existing master cylinder (is the leverage ratio the same on 96 master and 04 master)?
3. Just buy a 2004+ front brake caliper/hose/lever setup for $50 on eBay

Brake rotors are 240mm for both years, so the existing rotor should be fine.
What else do I need to buy?
1. 2004 axle + nut
2. 2004 wheel spacer
3. ???

Thanks!