The best advice I've seen on this subject is to send your vendor a written request for the information. If you do not receive it by December 1, write again. Obviously, you cannot beat it out of them.
Clearly, the people who wrote the reg felt they had built in a compliance mechanism that would take minimal effort. Perhaps the vendors don't see eye to eye with the draftsmen.
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Try? There is "do" and "do not," there is no "try." Yoda