Preparing a Rover Streetwise for MOT, I needed a new rear wiper blade. Length of previous was 17.1/2 inches. Local Halfords has a long display of assorted wiper blades, their own brand and Bosch. I presumed own brand were the cheaper, so bought a Halfords 17 inch blade. Got it home, tried to fit it, it had fittings I have never seen before, and a pictorial guide on the back of the box, no written instructions. I could not figure it out. I told SWMBO I have been fitting wiper blades for 60 years, and every time it is a challenge. I found the receipt, and took it back to complain.
I found the manager, who had served me less than an hour earlier, and demanded that he fit it for me. He told me it was the wrong blade. I said I thought all their blades would fit any car. He asked what car it was for, I told him. He went to the rack of blades and gave me a Bosch one, same length. I thought it would cost more, not so. Halfords blade cost £15, Bosch £10. He gave me a £5 refund.
I enquired how I should have known which blade would fit my cat. Best to ask, he said.