Any 16V, 4700uF (or thereabouts) electrolytic cap should do the job just fine. The Novak cap will work perfectly, but personally, I'd just buy a cap from somewhere like Maplin. Much cheaper and every bit as good, but you'd just need to solder wires on yourself and it doesn't have the Novak badge. You could buy a whole load for the same price as a single Novak cap. Preferably, the capacitor needs to be "low-ESR"...but I won't get into that lol. If you get one from an electronics supplier like Maplin, then as long as rated to 105 degrees, it's probably low-ESR (even if it doesn't say).
Sorry if I'm a bit late on this, but just thought I'd give my 2 pence if you hadn't already sorted it.
