Abstract: A novel apparatus and method for the conversion of the hardtop vehicles to removable top vehicles is disclosed. The conversion includes the severing of a portion of the hardtop and the attachment of a roof cap member to the removable top. The cap includes a cantilevered forward section adapted to seal and conceal the juncture of the top leading edge and vehicle header. A roof stiffener secures the leading edge of the severed roof top to the roof cap. Novel transition seal pairs and an elongated header seal are provided to seal the juncture of the vehicle header and the leading edge of the removable roof. Mating upper and lower caps are secured to the rear severed edges of the vehicle and hardtop. Latches are provided to secure the hardtop in position and are adapted to include positioning adjustments to properly fit the hardtop to the vehicles.Other features and improvements are disclosed.