You may have gotten the wrong star kit for your car. Yes, it does come in kit form(about four pieces)and is fairly hard to install. It is best to remove the base from the grill and get the base(looks a radiator cap) on a bench where you can work on it.
The part number for your car-115 586 04 88 and should cost about $15.50.
Hood stars for the 123 and 126 chassis are easy to install.
Bill Lewallen Lex.Ky.