The requirement is for 28 EA of NSN 7R-6220-016578225-P8, TDP VER 001, with delivery FOB origin. The item is flight critical and/or lacks adequate technical data for full and open competition, so Government source approval is required prior to contract award. Only previously approved sources were solicited, and new-source approval is normally too time-consuming to delay award. Non-approved sources must submit the required NAVSUP WSS Source Approval Information Brochure documentation with their proposal, including a cover letter if a source approval request is already under evaluation. Offers missing required data or proof of prior data submission will not be considered, and award may proceed based on Fleet support needs if source approval cannot be completed in time.