You can buy the parts, linked above, for $53 and hope you can make it work and fix it.

Or spend $99 and get an entirely new fork. More modern. Coilspring based rather than elastomer.

for 26' wheels, 1-1/8 steerer, mounts for your canti brakes.
Rockshox XC28 Suspension 26" Fork > Components > Frames, Forks and Suspension > Forks | Jenson USA