I'm off to France in August so need to get stick-on headlamp beam converters. There are lots of different brands (and unbranded ones on eBay) but it seems to boil down to just two shapes. All claim to be compatible with "most" modern cars but as the Copen headlamp is quite curved I'm concerned it may not be one of the "most". Does anyone have any experience and would you recommend one over the other?