Fender pickups with be a direct fit, the wires will be black and white, make a note where each goes. You don't need to change the cap.
If you are not comfortable soldering the new pickup to the pots, there is an alternative method, where you can cut both wires between the old pickups and the pots. Then carefully expose the copper wire, do the same with the new pickups (don't cut this wire though!), twist the two black copper wires together, do the same with the white ones, then wrap electrical tape around the wires to protect the connection, and this will work to connect the new pickup to the pots, and everything should work fine.
What are you trying to achieve by changing the stock pickups with these new Fender vintage ones?