Which CCFL is needed for Aluminium iMac (Mid-2007) 24"?

Does anyone know what the size/specs of the CCFL are for the iMac (Mid-2007) 24” please? I suppose I could crack it open and have a look but would prefer not to before I’ve got a part on order.

I am assuming the CCFL is the defect.  The screen flickers like an old fluorescent tube would, now increasingly often. The iMac is working great generally (with max 5GB RAM and an SSD). The screen works just fine through MiniDVI too - but it’s just unwieldy for an iMac. The display flickering stops with a sharp tap of my hand on the Aluminium, and correct image restored… for a while. When it sticks as dark for a moment, the screen image is ‘visible’ when I shine a light on it, so I think that makes backlight most likely issue.

(Should I consider an LED alternative while I’m at it?)