I will have to look at some of mine, but I don't recall ever seeing any Lefevers bushed except some early ones with the screw-in bushings. I Have Hs from in the 40K range into the 70K range. Have an E in the 10K range & then a G in low 20K range. If any of them have a bushing other than that one 10ga-E Pivot Lefer SN 10,515 with the screw-in I have never noticed it.
Miller
PS; How did you determine which way they were inserted from, are they bigger at the rear than on the breech-face?

Miller/TN
I Didn't Say Everything I Said, Yogi Berra