From Queenpedia.com

US 7" Promos

Don't Stop Me Now Released: 1979 Side A: Don't Stop Me Now Stereo Side B: Don't Stop Me Now Mono

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Under Pressure Released: 1981 Side A: Under Pressure Stereo Side B: Under Pressure Mono

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Hammer To Fall Released: 1984 Side A: Hammer To Fall (Headbangers Mix) Edit Side B: Hammer To Fall (Headbangers Mix) Edit

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Princes Of The Universe Released: 1986 Side A: Princes Of The Universe Side B: Princes Of The Universe