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Amazon.com : (3-Pack) Rear Lens Cap for Pentax K Mount, PK Lens Cap, Kmount Lens Rear Cover, PK Camera Body Cap for Pentax K K-70 K-1 K-3 II K-S2 K-S1 K-3 K-50
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T2-PK Lens Adapter Ring for T/T2 Mount Lens to Pentax K-70/K-50/K-30/K-500/K -1/K-3/K-3 II/K-5 IIs/K-5 II/K-5/K-7 K-Mount Cameras - AliExpress
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