To match certain Trimark entry and baggage door lock models, you will need to identify the version of the lock.  This is a number stamped into the lock casting.

You will need to take you the interior handle completely off the unit.  On the back side of it there will be a plate attached that is black or brass in color.  A spring connects into that plate.  There will be a five digit number starting with 1 or 2 either stamped on the plate that the spring connects into or on a rivet that holds a rod to that same plate.  

Pictures are attached to help identify where that number is located.

If you can get us that number, we can source the correct lock assembly to fit your door.