OK, I know what you are referring to now. Those were the old aftermarket Champ type bushing replacements that were aftermarket. FoMoCo only sold the O1A-7354-A clevises and replacement arms. The "screw together" ones were an aftermarket replacement part. They were either plastic or fiber with a steel threaded bushing and a wave washer. Here is a link for the ones made by Champ.
http://www.ebay.com/itm/2-NEW-GEAR-S...pXNiDu&vxp=mtr
They would be NOS aftermarket parts to repair the original clevis & arm bushings. The brass ones are a bit easier on the shift rod ends and the pins on the transmission arms. They wont flex much either since they are of a harder material than rubber but they will work.