RHD conversion steering box question

[721302]

I am working on doing a RHD swap on my 72 super and have found a source in Austrailia for the parts and was wondering if a 73 steering box will fit my 72? i know 73 was a change over year in which the later cars had the 2 bolt struts but i have also read that the rack and pinion came out in 73 and that all the steering boxes are the same from 71-73.5 untill the r+p replaced the boxes.