replacing 69 front brakes/suspension

[69vetteside]

hi all and merry xmas.my 69 stepside has had the front brakes converted to discs.i want to replace the brakes and steering as they are getting worn.
The truck was done in the states many years ago and i am the 3rd owner in australia.
My Q.is would it have the 73 onwards conversion done to it(it has 2.1/2" drop spindles)as this seems to be the common conversion done when changing to disc brakes.
can i just get another brake kit sent over from the states (CPP)

cheers