of the keepers 72 73 relative to the track 62 and the channel 75 will change fig1 a shows the increased distance between the keeper 72 and the track 62 while fig1 b shows a second pre formed slot 79 in the profile 74 which is further from the channel 75 functioning as the keeper 73 as such the same profile 74 is able to provide two differently positioned keepers 73 in order to accommodate the different width panel 78 fig1 shows another panel 80 of even greater width in this case the keepers 72 73 for the top and bottom shoot bolts 9 are both separately mounted in a timber frame 81 adjacent the track 62 and sill 82 it should be appreciated that since the interior face 53 of the panel 80 is used as the datum point for the assembly 1 the position of the groove 2 rods 11 and handle mechanism 5 within the panel 80 is the same regardless of the width of the panel 80 this means all of the components of the assembly can be universally applied to different width panels including the handle 8 lock barrel 47 and hinges 15 the only change required for door panel system 60 if different width panels are used is for the keepers 72 73 to be moved relative to the track 62 and channel 75 and a different sill profile 74 or an independently mounted keeper 73 may be needed if the profile 74 is not already configured to provide optional keeper positions as such no changes are needed to the assembly 1 for use with different width panels this is in marked contrast to the prior art where different hinges handles and lock barrels would be needed it.