one problem i have is the air filter i got for my 1977 450se but it was way too small, now im trying to find out information to see if my air cleaner box is a different one to the standard item or if the filter was just the rong one, any help and part numbers or just anything you can find out for me is a big help. The air cleaner that is on it was not a perfect fit i dont think either with it split and rapt around inside the airbox,( in other words it wasnt a joined unit like a horse shoe) is this normal or is there a filter that fits perfectly or do you just cut the new item.