You will need to cut them to length, it’s piano wire, your build will nearly always be different to someone else’s because nobody sticks the servos in the same place. Put the servos near the back of the space for them in the fuselage, the TT can be nose heavy.
Check out K&S metals stockists for music wire, it’s 1,3mm diameter or 0.047 inch. The K&S stock number is 502.
You can make it from one 36” length, but a couple of lengths is useful anyway.