Wow. That looks like someone figured out how to use the OE Plugs C, D, F, & G as seen on pg 2 and pg 12 of the 5393F.PDFIf you are looking for fitting the wiring harness that addresses the rear sensor electronics then here are links to EU fitting instructions:
https://www.mvg-ahk.de/out/media/5593f.pdf
https://www.pfjones.co.uk/pfjoneswiringkits/19120526PF-MAZDA-3-CX-30-19.pdf