Tim, if you have the power assist like Pixie's, the pair of small levers in her photo would be mounted right on the front frame of the driver's seat, and the big levers for the manual steering are mounted to a bracket on the floor under the dashboard. there would be four master cylinders on the bracket, one each for the clutch, the brake and the two steering levers. If these are what is leaking, a rebuild kit is only about $22 (Carquest # BRK M157). The bores of the master cylinders may be pitted from rust, but as Boggie told me, you could fill the pits with JB Weld (2part epoxy putty) and hone them smooth. A new complete master cylinder is available as well- it was used in Dodge trucks as a clutch master cylinder in the 50's and 60's. I took all four out and fixed up the two best ones and used them for the clutch and brake, and junked the manual steering system and just use the hydraulic. The power assist system uses different slave cylinders than the manual only system according to my parts manual. Later Muskegs used a double piston master cylinder for the steering instead of two separate ones, which might be what you have, but rebuild kits should be available for those too.
If the leaks are in the slave cylinders, you probably have to go to Boggie or Prinoth or someone else who handles Bombardier parts. Where ever they are, brake fluid leaks cause lots of rust destruction, so fix 'em soon, clean the metal in the area and repaint it before it eats away too much!
Does your live hydraulic pump run power steering, or something else?