the roller track 32 via the rollers 42 moreover the first rigid bracket portion 51 has a vertical open ended slot 54 that extends from its lower edge for receiving a portion of the locking mechanism 43 therein more specifically the locking mechanism 43 is retained in the open ended slot 54 by the roller track 32 when the first mounting arrangement 33 is mounted on the roller track 32 as can be seen in fig6 the sliding member 44 is positioned between the mounting bracket 41 and the rollers 42 to overlie surface of the first rigid bracket portion 51 that faces the roller track 32 the sliding member 44 is preferably made of a material having a low coefficient of friction relative to the metal of the first rigid bracket portion 51 of the mounting bracket 41 so that that the sliding divider 35 moves smoothly among a plurality of positions within the vehicle cargo area 12 for example the sliding member 44 is constructed as a fiberglass reinforced nylon insert basically the sliding member 44 has a plate shaped portion 44 a and a pair of projections 44 b with holes that the pins or bolts 53 pass through preferably the plate shaped portion 44 a of the sliding member 44 has an overall shape that is generally identical to the overall shape of the first rigid bracket portion.