We needed a new battery box after the door fell off the old one and damaged the hinges in the process.
This NBBS box is exactly the same size as the old one, so was a drop-in fit. Some of the fixing holes lined up with the old ones. Some needed new holes.
The previous screws were pan-heads, but pan-head screws along the bottom of the new box caught the bottom edge of the door, so I have now put countersunk stainless steel screws in those positions.
The lock was quite stiff to start with and needed some oil. It took a phone call to Jacksons to find out that is is a 180 degree turn to open it, not 90 degrees as it felt.
It came with a good length of mains cable and battery cable, though in my case it was easier to use the cables already fitted in the caravan.
Very pleased with it.