if i remember correctly, they are available from ford, but price is a bit high, compared to new renewed calibers. you should ask the price from ford, and compare some prices between new calibers and seal kits.

you should use the same type brake fluid that you had. i would bet you have Dot 4 brake fluid. only on a pure race car i would consider using Silicone based Dot 5 fluid.

note that you should not never mix those braking fluids.