Alloy Quick Release Cyclone Seat Clamp For Road MTB And Road Bikes Available In Multiple Sizes 28.6/30.2/31.8/34.9mm From Epokcycle, $4.96 | DHgate.Com
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KC89 Quick Release Lock Seatpost Clip for 26.8/30.2/31.8/34.9/38.5mm - Walmart.com
Bike Alloy Seatpost Shim 27.2id 30.2od Silver.
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No Brand Logo Road Bicycle Seat Post Clamp 34.9 For 30.8 31.6mm 30.2mm For 27.2mm Seatpost 3k Full Carbon Fiber Mtb Bike Seat Pole Clip From Kennyli6, $8.49 | DHgate.Com