This is a grease seal used on 64-66 V-8 Mustangs. It is about 1 5/8 inch in dia and located on all idler arms to center links and on the non-power steering Pitman arm to the center link, although poorly documented. I took these two off my Oct, 65 San Jose build "K" Fastback. As far as I can tell from the Ford Car Parts book, Ill sect 32, pg 3, this seal is only used on Mustangs and 66 V-8 Falcons. It is not serviced as indicated by the star prefix to the Ford base number "3A196". The only markings on the part are "KF" and "14-190" on the side, and there is a 15 and 114 but I believe they are mold numbers. As far as I can tell, nobody reproduces this seal and the seal supplied in idler arm kits is a foam doughnut.
Brant, Here's another rubber item to get reproduced.
Jim