From Brewer's site,
SC664 SPEEDOMETER CABLE 1966-67 A & B BODY Details
New speedometer cable fits all 1966-67 A & B-body cars. Correct black housing, 63" long. Firewall grommet NOT included.
Price: $59.95
Will this work for me?
Assumption 1: automatic speedo cables and manual trans cables are the same.
Assumption 2: The speedo cluster attachment is a screw on type all the way up to 67.
Assumption 3: The trans end of the 66 904 is the same up to 76.
Assumption 4: The new style speedo attachment (white clip-on) started in 68.
How did I do?