Home › CFR › Title 48 › Part 25148 CFR Part 251 — Use of Government Sources by ContractorsSubpart 251.1 — Contractor Use of Government Supply Sources§ 251.101— Policy.§ 251.102— Authorization to use Government supply sources.§ 251.107— Contract clause.Subpart 251.2 — Contractor Use of Interagency Fleet Management System (IFMS)§ 251.202— Authorization.§ 251.205— Contract clause.