Abstract: A support mechanism supports a seat back 14 on a seat frame 12 and includes a tongue 18, 20 and groove 22, 24 connection for mounting the seat back 14 to the seat frame 12 by sliding the tongues 18, 20 into the grooves 20, 22. A channel member defines the upper rail of a seat track with inner and outer sides 26 and 28 and a top 30 extending between the first 26 and second 28 sides. The tongues 18 and 20 extend in opposite directions and are coplanar with the top 30 of the channel member. A pair of brackets 32 define the grooves 18 and 20 which are disposed about the tongues 22 and 24 of the channel member to limit movement between the brackets 32 and the channel members in a direction transverse to the tongues 18, 20 and the grooves 22,24. Once the brackets 32 are slid onto the channel members, a rivet 42 is inserted through each bracket 32 and through the top 30 of the associated channel for preventing the sliding movement of the brackets 32 along the channels.