I have a 67 Firebird 400 4 speed, and I purchased as a roller. I have completed disassembly and ready to get body work started. I have noticed that I have both traction bars, but only (1) of the rear brackets with stamped number of 9789807 and in need of the other one stamped 9789808.

I have two questions:

1) which side do I have currently (Driver side or passenger side?)

2) What is the difference between the two brackets? If I was to purchase the same part number, would I be able to use it or are they that different they cant be cross used?