252.101 - Using Part 252
(b) Numbering.
(2) Provisions or clauses that supplement the FAR.
(ii)(B) DFARS provisions or clauses use a four digit sequential number in the 7000 series, e.g., -7000, -7001, -7002. Department or agency supplemental provisions or clauses use four digit sequential numbers in the 9000 series.

252.103 - Identification of provisions and clauses
For guidance on numbering department or agency provisions and clauses, see PGI 252.103