What dimensions are you looking for?
We have hanging rods in two different closets at the rear of our SMB. One we use every trip for hanging clothes. The other is there if we need it, but that closet also has adjustable shelves and we normally use the shelves. The widths of the two closets are different, and IIRC there is no standard length for the hanging rods. Just like the closets can be any custom width, I suspect the rods are the same way.
Greg in Austin
2008 Ford 6.0PSD EB/E-PH SMB 4X4 Aluminess f/r bumpers (13.5mpg avg, 15mpg hwy) 52k miles [Texas McBeast]
2006 Toyota Prius (48 to 68 mpg) 120k miles [Penelope]
2013 Jeep Wrangler Unlimited Rubicon (15 to 18 mpg) [Johnnie]
2012 Mitsubishi MiEV (no gas required) ($.50/day in electricity) [Evie]