newb here...just got a set of steeda UDP i won from prestigemustang.com. they are used pullys form a steeda stang and said they crossed referenced the part # and they were certain that they were the actual steeda UDP that go for $200. well i just opened the box, and i do not see a part number, or anyting writed, scribed or anything. is there any way of making ertain that these are the pullys i need? thanks