at the minuite ive got 280mm 2wd sierra cosworth front discs on my car with rs turbo callipers its a 89 s2 rst

will these discs go straight on as i need mine replaced as there very worn and these seem ideal for the cost if they will fit
http://cgi.ebay.co.uk/ford-sierra-co...item3a5713aacc

thanks for any help info in advance