Plan Number for Wrap Plan Document

[IhrtERISA]

Greetings:

Employer has never filed any 500 for their component benefit plans (life, health, vision, dental) because they are under 100 participants (nor do they have an assigned plan number). The insurer gave their FSA plan number 501 (which has also never filed a 5500).

Employer now has a wrap plan document. We believe that the Wrap Plan should be plan number 501 (along with all component benefit plans under the wrap). Another vendor believe that the wrap plan document should have a unique number from the component plan documents.

Is there any reason why a wrap plan document should not have the same plan number as the component benefits?

Thank you

[jpod]

If there were good SPDs (perhaps a big "if"), didn't plan numbers appear in the SPDs for the component plans?