I changed mine as VW refused mine, similar reasons. If you can get a secondhand GTI tailgate with the correct coloured glass you won't have the pain of changing the glass and swapping the spoiler over. Take your time with swapping the wiring and get a second set of hands to list the new one in place. £50 for the tailgate, £70 to pay someone to change the glass I made most of that back on eBay selling the duplicate parts.