Locking mechanism jammed, need new one.
The measurement inside of the latches appears to be 5-1/4" (whereas your part 82-265 shows this dimension as being 5-11/16", so that part doesn't appear quite right).
9/16" width mechanism. End to end of machanism (that item in photo, without face plate) is 10-1/16 (shy of 10'1/8").
Outer faceplate holes ctr to outer hole ctr is 9-7/8". Inner faceplate holes 3-5/32".