48 C.F.R. § 227.7009-1
227.7009-1 Required clauses.
(a) Covenant Against Contingent Fees. Insert the clause at FAR 52.203-5.
(b) Gratuities. Insert the clause at FAR 52.203-3.
(c) Assignment of Claims. Insert the clause at FAR 52.232-23.
(d) Disputes. Pursuant to FAR 33.014, insert the clause at FAR 52.233-1.
(e) Non-Estoppel. Insert the clause at 252.227-7000.