just checked over it now. Yours is the same as mine conversion wise. The new spoiler looks like its going/or is going to cover the top part of the lights left and right. did you get new ones or does this not matter.
It doesn't matter - the top part of the lights doesn't actually function anyway (no bulbs behind there), just a reflector, if anything.
Your car is a mk2.5, and I'm guessing that it's either a Studio, Style or ECOnetic trim level. The spoiler you've purchased is from the exact same car, but it is only standard in the Zetec/Titanium trim levels.
It's a genuine Ford spoiler designed for your car, but in a different trim level, so no need to change the lights or anything of the sort.
Your new spoiler is pretty much the same as the old one apart from those flappy bits that stick out and cover the top of the lights - and of course, that it's body-coloured.