You can buy a replacement shaver head and screens from an Oklahoma shaver business, electric shaver company.
Here's a link to their site and the page for the Norelco shaver you're looking to get parts for. The 3rd item down is the shaver head and screens, blades, etc.
I don't think you can get just the plastic retainer all by itself, as the manufacturer makes a complete head and blade as a replacement set, however, you can call them to see if they have just the retainer part you need. But frankly, it's likely a good idea to change shaver heads every so often to get the best shave, etc., so you might just want to spring for the complete replacement assembly part #HQ9 on this site for under $40.00.
http://www.electricshaverstore.com/get_list_143.htm
Hope you find this Very Helpful and best regards!
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