Convert 70 to 72 Disc brakes

[Olive1970]

I think I have a good idea for what needs to be changed in the swap as far as suspension parts.

Use upper and lower control arms and spindles.
Use calipers and hoses.

Now, what can be done for using my 1970 steering components on the 1972 spindle?
I will be purchasing 6 lug rotors through ECE or CPP because I want to keep the 6 lug for the original rallye wheels and cost of new wheels with 5 lug.

Is there anything else I am overlooking?

Thank You!