A person who lacks information or documents necessary to file a request for review pursuant to subpart C or D of this part, or necessary to a decision whether to seek review, or necessary to participate in an appeal pursuant to Sec. 4003.57 of this part or necessary to a decision whether to participate, may request the PBGC's assistance in obtaining information or documents in the possession of a party other than the PBGC. The request shall state or describe the missing information or documents, the reason why the person needs the information or documents, and the reason why the person needs the assistance of the PBGC in obtaining the information or documents. The request may also include a request for an extension of time to file pursuant to Sec. 4003.4 of this part.