The boot is going to be hard to find… it’s completly different to the US one… My suggestion, go to a wrecker and try and find some other boot that is similar… I’ve never had to look for one, so i’m not really sure where to start…
as for the Harnes, H4 harnesses work fine… but you still have to use h4h bulbs (they have the same 3 prong plug on the back, but a different mounting bracket around them)
If you need help with the wiring, use the wiring diagram off my tegtip…