I currently have a request to extend what was initially a 6-month fixed-price delivery contract using FAR 52.217-9, with the reason being the host country was not yet ready for receiving the items (the contractor has performed satisfactorily and had the items ready to ship when the contract required).
Because the exact amount of time the contractor will have to hold onto the items is not known, I was going to add a funded cost-reimbursement CLIN, de-obligating the amount not used once the items are delivered. Another CS informed me the FAR does not allow adding CLINs to an extension, but