82-086 Legacy Keyed Handle Set, 3-15/16" (1-1/8" to 2-1/2")
82-249 Sliding Glass Door Multi-Point Keeper
82-265 Multi-Point Mortise Lock with Face Plate, 11"
The parts you listed are all indeed compatible with one another, but it does matter a great deal if your door was designed to use them; i.e., if the mortise cavity in the door is is the right size for the 82-265, and if the hole spacing for a handle set is 3-15/16". Furthermore, the 82-086 key lock and thumb lever are offset towards the bottom of the handle. if the keyway in your door is centered between the handle set's mounting holes, then this handle set will not work.
They are made of metal. If you want a stainless steel version of the mortise lock, see the 82-259.