Unless you have a specific reason to run the hydro boost, I'd sell it off and stick to simple vacuum booster. The MC and attached lines are unusable to you as well.
Are you sure those parts came from a 1995? Hydro boost didn't debut until 1996 on the 4.6L mustang only.
Before I continue, need to identify what specific parts you have as there are slight differences. Also, what wheels do you plan on running, and can you snap a pic of front brakes for identification?
Also, do you want to install the entire rear axle? Or just take what you need and put it into your car? If you want to swap entire axle, need to confirm its a 94-98 unit and not 99+