I got a set from Sandy Bike Spares that didn't have the link pipe and the bracket for the footrest didn't line up, I think I ended up cutting the hole to turn it into an open ended slot. They will have been early Chinese copies, Sandy Bike Spares are now Black Widow Exhausts but the current ones they offer are different with separate header pipes and collector box. I think the ones I had had a larger connector pipe than standard that meant the end can fitted directly on without the gasket