Copied from website:
"Genuine Manfrotto lower leg collar for the 1st version 190CL, 190CLB, 190D, 190DB, 190NAT3, 190PRO, 190PROB, 756B, 3001N, and 3001BN. Made by Manfrotto Italy. Our measurements of the legs using this collar, 17/14mm. Measure the collars or legs you have.
Use option to select new or used parts."
With original screw and washer, in original bag.