Hagar

Hi all, first post. I have a 1.4 1997 ZX Estate, RHD, and I'm now living in France. I need to replace the headlights with their LHD equivalent to pass the French CT (MOT) and re-register. The indicators will also need replacing due to cracks/damage, I may as well do it at the same time. The current units are twin H1. I have seen H4 units for sale much cheaper are they interchangeable albeit with a bit of electrical work ? Are the mounts the same? They seem a lot cheaper. I have also seen some after-market replacement units which cost a bit more. Some have the indicators integrated into the unit. Are they worth the extra? Any recommendations appreciated, thanks.