The armature bolt is not available on its own, but it is included in the armature mounting fastener pack, part#
P44489128 for M450/M420
P44497110 for M490
The default backset is 2 3/4" and the latch faceplate dimensions are 1 1/8" x 2 1/4".
The latch supplied is the 13-047 deadlatch and 13-048 springlatch.
The bore size is dependent on the function of the deadbolt. Some functions can be installed into a 1 1/2" or 2 1/8" bore while others require 1 1/2" only. You need to reference the dead...