The manufacturer does not give the receiver opening dimension. The bike rack cradles are designed to as replacement only for the item #5088208model 18085 and item #5088283, model 18087. If you do not have one of these bike racks, it will not fit.
Curt Manufacturing, Tray-Style Bike Rack Cradles for Fat Tires, Model# 18091

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- 4-7/8" inside width accepts most types of fat bike tires
- Add-on cradles are designed to replace existing cradles
- Adjustable cradles accommodate various bike sizes and styles
- Tray-style design allows for easy loading and unloading of bikes
- Compatible with all CURT tray-style bike racks
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