Fazer Down Pipes and how to fit new ones

[Dead Eye]

I've recently had a set from Sandy Spares via their eBay site - arrived fast and lined up absolutely perfectly. As far as getting the old ones off, I had only one issue which was that one of the nuts that holds the pipes on, unscrewed from the actual head so I couldn't replace it with a new stainless steel one (didnt want to push my luck by seperating them). I took some advice of spraying WD40 on the nuts and ended up doing this twice a day for about 5 days and they practically fell off