A bathing system assembly has; an accessory such as a grab bar, a seat or the like; a first mounting bracket affixed to a structural wall; and a second mounting bracket attaching the accessory to a bath wall. The second mounting bracket cooperates with the first mounting bracket for easy installation of the bath wall and accessory to the structural wall, e.g., stud wall. The bathing system wall including the accessory and the second mounting bracket is manipulated by an installer so that the second mounting bracket and the first mounting bracket cooperate to support the wall and the grab bar. Because the accessory is attached directly to the second mounting bracket, flanges and attachment means for hardware are eliminated. The accessory may be attached to the second mounting bracket through the bath wall at a first location and attached to the first mounting bracket at a second location.