3859861 65-70 Chevy Pass.
GM Part # 3859861 Z Bar Frame Bracket
65-70 Chevy Pass. Frame Bracket
This equalizer frame side bracket is welded onto
the top of the frame.
Slot
The ballstud mounting is via a basic vertical slot.
Measurements
Overall width is about 1 3/4" with one side nipped
off. overall length is 1 1/4". Slot is about 11/32" x 3/4".
Applications
3859861
0.852 BRACKET, Clutch Shaft Frame
65-70 Pass. (exc. Police, Taxi) (Chevy Parts Books)
Disclaimer:
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts are for replacement parts that were available at the time of parts book printing.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!