The dimensions on the drawing are correct. The R1 note covers four items, each separated by a semi-colon. So there should be four references to R1 on the drawing somewhere, one of which is the in section for F-601Z. The overall height for the F-601Z must have been omitted on the previous version of the drawing.
The mention in the R1 notes of "4 13/32 was 4 7/32" refers to another item on the drawing, which is a change in location of the nose gear access hole, see FIREWALL PENETRATION POINTS, DWG 19.
I don't think the position of the F-6122-1 brake bracket is critical. Use nearby stiffener rivet holes as references to position it. I tried to position it a closely as possible to the drawing.