I am not suggesting by any means, that you actually use a wire. What I was actually trying to say is that you are overthinking the situation -- that the application is not so particular or specific that a replacement resistor not actually work. You could get a resistor that is 2.2 ohms or 6.8 ohms, or maybe even 10 ohms and I believe it will still work. You can get a wire and it will work. The most important thing is to make sure it is a 1/2watt fusible type. Therefore, the replacement resistors WILL work if you get a 4.7ohm fusible resistor.