I got a set yonks ago for my corsa,good and solid in my opinion.but because I have some mods done to my wings and back arches they are bout an inch too long, has anyone ever shortened a set of these?, would seem to be an easy job with fibreglass ones but these seem to be rubber the whole way thru,might be tricky, can it or has anyone tried to change the lengh of them before? I have a spare set of wings which I could shape to make them fit perfect,might be an easier option,would be preparing and painting them myself, thanks for any suggestions