FAR 



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.