48 CFR § 308.405-6
Limited source justification and approval
November 17, 2020
(d)
(1) As required by Federal Acquisition Regulation (FAR) 8.405-1 or 8.405-2, the responsible program office must provide a written justification for an acquisition under the Federal Supply Service program that restricts the number of schedule contractors or when procuring an item peculiar to one manufacturer.