Procurement of Selector, Ejection Sequence for F-15 Aircraft.  This is under the following competitive NSNs: 1377-01-437-4075 ES, 1377-01-479-9295 ES, and 1377-00-349-3943 ES.  A First Article is required for vendors that have not manufactured the part within the last 48 months. There is a Bid A/Bid B.  Bid A is for companies that need a First Article.  Bid B is for companies that do not need a First Article.  Source Qualfication Statement:  Award will not be held up for a vendor to become qualifled.