Woot offers HITOWMFG 1-1/4 inches to 2 inches Hitch Adapter Towing Hitch Receiver Mount Bar with Pin & Clip for $9.99 (orig. $23.99). Free shipping for Prime Members.

Product Description:
Adapts a 1-1/4" receiver opening to a 2" receiver opening, set comes with pin & clip. Distance from center of pin hole to pin hole: 6-1/2". Enables a 1-1/4 inch receiver to fit popular 2 inch tow hitch accessories such as bike rack and cargo carriers (PRODUCT NOT FOR TOWING).Finished in black powder coating provide durable and strong conditions, resist dust and corrosion, adds extra durability. Heavy duty steel via robotically welded for superior strength provide excellent mounting facility, high quality hardware fittings, all make this adjustable trailer hitch more durable 

• Adapts a 1-1/4" receiver opening to a 2" receiver opening, set comes with pin & clip
• Distance from center of pin hole to pin hole: 6-1/2"
• Enables a 1-1/4 inch receiver to fit popular 2 inch tow hitch accessories such as bike rack and cargo carriers (PRODUCT NOT FOR TOWING)
• Finished in black podwer coating provide durable and strong conditions, resist dust and corrosion, adds extra durability
• Heavy duty steel via robotically welded for superior strength provide excellent mounting facility, high quality hardware fittings, all make this adjustable trailer hitch more durable