In addition to the sensors and bumper covers, I think you need to add KCAN wiring harness from front to back; dunno about wiring to front bumper. You'll also need to code it in. I briefly considered adding to mine, as we've gotten used to PDC (have on our other cars since 2006). But it'd be expensive to add as a stock-BMW thing.
On the plus side, if you do the research and add up the costs, it'll likely make the Bimmertech cameras seem like a bargain at $950 front+rear.
https://www.bimmer-tech.net/shop/bmw...sist-retrofits
note that Bimmertech also offers a PDC retrofit kit with used OE sensors. I didn't ask if their kit assumes use of non-PDC bumper covers.