Garage door repair - cable snapped

[boolie]

just bought a house - a very old house. I dont think the previous occupant ever used the garage! I tried to open the garage door and immediately discovered that a cable was snapped

Anyway, I think this is the correct kit to fix it but am not sure - amazon description states it's for Henderson doors (whatever they are)

https://www.amazon.co.uk/repair-Cab.../B00JM8PHE0/ref=psdc_1938019031_t1_B00JBI2KZK

So is that the right kit to fix this door?

 

[crank39]

It does look like a Henderson Merlin, cones and cables are a doddle to fit but seeing as a cable has snapped I'm guessing you need to pretension the spring as well