M_Boats: help with slug order

I just visited west marine, and am very confused about the sail slug ordering.  Can anyone give me the exact item I should order to get the right item to convert to sail slugs from the mainsail bolt rope?  Doesn't have to be Westmarine, of course! I see the thing called "Battcar" and all I can think of is that it has something to do with the "Battcave" and the "Battmobile" and Robin, and the commissioner... Too late for me, I think! Danelle "Ceto" M17 #378 Ketchikan, AK http://web.mac.com/anniesark9/Site/Sailing_Ceto.html