to line up etc. They do go on but only after 20 odd tries. Once on you could call your self a master beater, well a panel beater that is 
Plus side, will never rust and if you want to do suspension work on your car at a later date, just unbolt and jobs a good`un. They are cheeper and 9 times out of ten if you bought metal ones they`ll need beedblasting to get all the rust off, more money!
Unless your a limp wrist (purist) fiberglass it would be.
