Here's the part #'s for the Parking Brake Levers .
I've searched the entire country high & low & ebay since 2007 and they can't be found GM NOS .
I've never seen them on ebay in nos condition & I check ebay ever other day for years .
They were discontinued by GM in ( dec. 1971 ) , that's ( 48 ) years ago .
PIC
https://i.postimg.cc/sXvS9C0n/zz3-Parking-Brake-Levers.jpg&
I bought these used levers on ebay . Mine were missing .
https://i.postimg.cc/9fBYTCvQ/Parking-Brake-LEVER.jpgDonor Levers
MUST come from a single wheel axle without a propeller shaft brake .
George
'54 3600