Section 250-173-3 - REQUIREMENTS AND METHODS FOR MARKING CATALYTIC CONVERTERS FOR PRIVATE INDIVIDUALSA.Requirements: Private individuals who detach a catalytic converter for replacement shall legibly mark the catalytic converter.B.Marking Standard: The marking shall consist of the complete and legible VIN in a single line. If there is not adequate space to mark on one line, the VIN may be marked in multiple lines in the correct number sequence.C.Marking Errors: A straight line shall be drawn through the entire VIN when an error is made in marking. The correct VIN shall be marked directly below; if there is not adequate space, the correct vin shall be marked in the general area.D.Method: The marking shall be made by engraving or a method of permanent marking.E.Missing Number: Individuals who own catalytic converters that do not have a legible or complete 17-digit VIN may request an assigned number from the Secretary of State Enforcement Division through the process outlined in section 4 of this rule.29-250 C.M.R. ch. 173, § 3