JC has those bushings for the two styles/sizes of sway bars used on 47-55 GM panel-body trucks (47-51 & 51-55).

Maybe your assembly is from the other style. It is worth a call to JC. If you have already checked this with JC, just ignore this post.

JC's bushings have worked on the two original sway bar sets on my 54 trucks; although, the bushings in the recent set I used were a little smaller in width than the set I bought 10 years ago.

I think the tie rod diameter from 46-55 was 3/4" diameter.