Great question.

Yes, you would include this clause in your solicitation and resulting contract and identify the items that (sling and cartridge) that are required by law to be obtained from nonprofit agencies participating in the program operated by the Committee for Purchase From People Who Are Blind or Severely Disabled (the Committee) under 41 U.S.C.8504.

Note if for some reason the mandatory source is unable to provide the items within the schedule, quantity, or quality that you require, paragraph (b) of the clause would cover that instance.