Trico 21-1 Exact Fit Conventional Wiper Blade 21", Pack of 1 Fully assembled one-step installation; blade installs in seconds Blade receptor precisely matches your vehicle's specific wiper arm No need to sort through numerous adaptors to find the correct one Lets any consumer change a wiper blade. Blade installs in mere seconds These refills are manufactured to fit the original equipment wiper assembly, If this assembly has been replaced with anything other than an OE product the refill may not fit properly