tailgate bar 90 yj

[midwest jeep fever]

got a newbie question, after much trouble getting a tailgate bar on ebay(first one bought on ebay was never sent had to complain to get money back) I can"t get it to work. I am wondering if their is different kinds???? I have the brackets already installed on the jeep which appear to be the same ones that work with this tailgate bar. any info would be much appreciated as I am getting tired of the cold air blowing thru the flopping back window lol