https://www.idn-inc.com/lcn-4040-drop-plate-aluminum-4040xp18tj-al.html
LCN 4040XP Drop Plate Aluminum | 18TJ Mount
LCN 4040XP 18TJ aluminum drop plate accommodates top jamb closer installations on frames with restricted mounting surfaces. Fits 4040XP series. 4040XP18TJ AL
plate aluminumlcndropmount