Sorry can't help you out as I don't have the S27 PE set. However, I do have the Scale Motorsports one. Do yourself a favour - scrap the S27 set and get the SMS set. It is far superior.
Check them out on their website I think the URL is
www.scalemotorsport.com
P.S. I have no connection with SMS, in fact I'm annoyed they won't answer my emails!