Although this post wandered into the BB linkage, the section in which it's located is just 67 Mustang.
So I'll dive into some 289 SBF stuff (unless we should start another thread)?
In the 60-68 MPC there is a section called "7521 ROD - CLUTCH PEDAL TO EQUALIZER BAR."
On the next page is a section called "7521 ROD - EQUALIZER BAR TO CLUTCH RELEASE LEVER."
Ford decided that the two parts should have the same section number. You might find this confusing -- I did.
If you look for a 67 equalizer bar to clutch release lever in the 60-68 MPC it appears you can only buy it as a two piece unit -- the swivel nut and the adjustment threaded rod as the 7521 illustration points to both pieces.
If you look through the 65-73 MPC there is a new section called "SWIVEL - 7A528 - CLUTCH RELEASE IDLER LEVER ADJUSTMENT" in which the swivel is called out as C8OZ-7A528-A r/b DOZZ-7A528-A.
I have the original worn out swivel and mine is threaded. It appears that the aftermarket (ACP) offers a threaded and non-threaded swivel. I opted for the threaded swivel. I found an original threaded rod as NOS.
Like others all of the above parts are plated, which I will remove to get back to bare metal.