Amazon.com: CURT 48630 Raw Steel Adjustable Pintle Hitch Lunette Ring 3-In ID, 12,000 lbs, 7-1/2-Inch Channel Height, Black : Automotive
DSI Automotive - Curt Channel Style Forged Pintle With Ball - 2-5/16 in. Changeable Chrome Ball - Fits Lunette Rings With 2.5 in. Or 3 in. Inside Diameter Eye - Includes Safety Pin - 45920
Specialized Uracco Optics Eyewear user reviews : 3.5 out of 5 - 1 reviews - roadbikereview.com
CURT Mount-Style Lunette Eye #48560 | Ron's Toy Shop, Inc.
CURT Channel-Style Lunette Eye #48600 | Ron's Toy Shop, Inc.
CURT Adjustable Lunette Ring (12,000 lb., 3 in. Eye, 7-1/2 in. Channel Height, Packaged), 48630 at Tractor Supply Co.