Which replacement brush fits Philips Sonicare ProtectiveClean 5100 - a W is shown on the brush head. I have already bought the wrong replacements, but unfortunately they don't fit. My handset has a round attachment with a side notch. I can only find replacement brush heads that fit the oval attachment, e.g. item 9699912. Can anyone help me?

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Unfortunately, all the ones I can find do not fit the hand-held device with the round attachment. There are many on the market for the oval attachment

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I tried to save money and bought "compatible" brush heads. They didn't fit.
Now I order Philips brushes for Sonicare "w" or "2w". No more problems.

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Question about Philips Sonicare ProtectiveClean 5100