Originally Posted by turbodoctor

the four spoke wheel is from the 90spec rs turbo n should come with boss complete. the series one came with a three spoke wheel of the same desighn and the sierra didnt have the wheel fitted as its an rs item, the sierra rs is also known as the cosworth or saph cosworth and these came with a full leather item with three spokes. if uve got the wheel but no boss then any r.s.t fitting boss will do as the bolt patern is of a global design and the r.s.t boss will take a momo or sparco wheel too as the paterns are all the same.