Philips Norelco SH50/52 Replacement Head for Series 5000 Shavers Silver SH50/52 - Best Buy
Amazon.com: Philips Norelco Genuine Replacement Head for Series 6000 Shavers, Black, 1 Count : Beauty & Personal Care
Philips Norelco Shaving Replacement Blades for Men's Shaver Series 9000, SH91/52 - Walmart.com
Amazon.com: Philips Norelco Genuine SH98/72 Replacement Shaving Heads compatible with Norelco Shaver Series S9000 and 9000 Prestige : Beauty & Personal Care