When determining the length of a grab bar needed, keep in mind that the overall length of the grab bar is about 3 inches longer (3.125 - 3.25 inches depending on the style of bar) than the name of the bar. So a 36 inch grab bar would measure about 39 inches end to end with the points for attachment 36 inches apart.
36 inch grab bars are a popular choice in bigger bathrooms or in commercial bathrooms that require a 36 inch bar behind the toilet. While installation into studs is always ideal, state of the art Snaptoggles and Secure Mount Anchors can make any installaltion in a hollow wall easy even if you can't locate the studs. All of our 36 inch grab bars meet or exceed ADA guidelines for safety in the bathroom.