Actually, this site sells 1 1/8":Are you sure it is 1 1/8"? 1 3/16" seems to be more common.
Parts- Saddles Assorted | Lazzar's Floor Jack Repair Parts
Lazzar's HCRC sells seal kits and floor jack parts. Looking for Saddles Assorted Parts? We have them!
www.hcrcnow.com
(#6 on the page)