Parking sensors fitting query?????

Morning peeps,,,

not messaged for a while due to car being ok (for a change 🤣)

but my VRS 2010 has no reverse sensors so I’m fitting a cheap aftermarket kit,,, had them fitted to other cars so I know they help,, as I keep forgetting this doesn’t have them and nearly back into things 🤣🤣,, 

would anyone know what colour the live would be on the reverse bulb wiring ?? And would the bumper have the marks on the inside where the factory fitted sensors would sit ?? 
my old focus had the location marks on the inside to help with height and position 

thanks peeps

ill do my other post now 🤣🤣