HQ177 replacement heads have been discontinued and replaced by another part number. You will find the new replacements from shaveroutlet.com at the link below
http://shaveroutlet.com/shaver-replacement-parts/norelco-philips-hq8-spectra-sensotec-replacement-heads-p-251.html
Testimonial: "right on thank you"
Replacement heads for norelco 7737x is philips norelco HQ177 replacement blades.
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