emergency brake strut levers and actuators for 10" drum

Save your aggravation they repro them from megaparts or Mancini I think it’s like 60 bucks for them all
What's the difference between pre-73 and 73 and up brake strut levers? My car is a 72 but not sure if the whole diff. is correct for that year? Was the difference in the shoes or backing plates in regards to the change in 73? Yeah, I'll probably buy repops.