Hi. Non-sport bumper with sport wings:
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I did try and fill in the 'triangles' by chopping up both a sport and non-sport bumper but got massively pissed off with it and sold the car. Should've just used fibreglass, but hey ho! Managed to find some pictures off of Photobucket... Seems like so long ago now!
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My advice would be to just buy the side skirts and get practicing with fibreglass. If you look at a 1*2 you'll see that the skirts joint the wings at a funny angle - you'll need to make a little piece to attach on the front - loads of people have done them before and they look decent. Google 182 replica side skirts, you get the idea.