Table 5.24 – Water Closet Location and Rear Wall Grab Bar
Current Guidelines:   
4.17.3  Size and Arrangement.  The size and arrangement of the standard toilet stall shall comply with Fig. 30(a), Standard Stall. . . . 

[Note:  Figure 30 (a) shows the centerline of the water closet as 18 inches (455 mm) absolute from the side wall.]

4.17.6  Grab Bars.  Grab bars complying with the length and positioning shown in Fig. 30 (a), (b), (c), and (d) shall be provided. . . .

[Note:  Figures 30 (a), (b), (c), and (d) show the length of the rear grab bar as 36 inches (915 mm) minimum.]
Final Revised Guidelines:  
604.2  Location.  The water closet shall be positioned with a wall or partition to the rear and to one side.  The centerline of the water closet shall be 16 inches (405 mm) minimum to 18 inches (455 mm) maximum from the side wall or partition. . . . 

604.5.2  Rear Wall.  The rear wall grab bar shall be 36 inches (915 mm) long minimum and extend from the centerline of the water closet 12 inches (305 mm) minimum on one side and 24 inches (610 mm) on the other side. 
Exceptions: 1.  The rear grab bar shall be permitted to be 24 inches (610 mm) long minimum, centered on the water closet, where wall space does not permit a length of 36 inches (915 mm) minimum due to the location of a recessed fixture adjacent to the water closet. . . .
Model Codes & Standards
ICC/ANSI A117.1-1998:  Sections 604.2 has an equivalent requirement for the water closet location.  Section 604.5.2 has a similar requirement for the rear wall grab bar.