GSI on Common Stock

We use a component on a number of different subcontracts with GSI. Ninety-eight percent of the time, the local Government QAR delegates GSI to the sources of this component.

Lead times for this component vary widely and we want to mitigate schedule risk by stocking this component. How do we "flow down" GSI on a PO that has no tie to a prime contract? We had a few components in stock that did not go through source inspection and we have been unable to utilize them on any order with GSI.