Hello all,i have a 87 d 50 4x4 that has wiper arms but a bought 2 different sets of wiper blades and both are to big (as in bigger than the wiper arms, where they hook together). Are the auto parts stores selling me the wrong blades, is there some sort of adapter, or is this an item that i need to special order. I know this is a stupid question but i sure could use my windows wiped.

thanks
Bob