Does anybody know how much it would cost to replace the top? I love the tan/black seat combo but not to thrilled with the tan top - would prefer black. My current understanding is that I cant just specifiy I want a black top with black/tan interior (please correct me if I am wrong - becauase I hope my sales guy is wrong) but if my sales guy is correct how much would it cost me to purchase a black top and have it installed ????