Marks 9000 Series Lock Case - Only;
Used with the 9215 or 9225 lever handles;
5/16 inch square spindle hole.
This is used on the lever sets, the knobs use a 1/4 spindle.
Backset: 2-1/2 inch
Standard Faceplate Measures: 1 x 7-1/8;
Optional Faceplate measures 1-1/16 x 7-5/8
Faceplate Color: Brass or Satin Chrome
Locks are handed but may be reversed.
Handed: Left hand Reverse (right hand)

See additional Images

Related Marks Hardware:
301067 - Used with knobs, model 90 lock case, Left hand Reverse (Right Hand)
301068 - Used with knobs, model 90 lock case, Right hand Reverse (Left Hand)
301069 - Used with levers, model 9000 lock case, Right hand Reverse (Left Hand)

Resource:
How to Rehand Marks Mortise Locks