I have an S7783 and these were the recommended replacement heads for my shaver. The screens didn't fit neatly in the razor, and the heads themselves didn't provide a shave. I checked the box twice and thrice here and on the norelco website. They have half as many blades as the heads that come with the razor. I've spent a lot of money on a comfortable shave and if that's the quality of the replacement parts I might be better off going back to my safety razor.
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