Mr G,
I have the same troubles with Panasonic National Parts. In general, the people that answer the phones are just taking orders and do not know the product at all. Frankly, confronted with the same situation, I would just order both.

Ed,
The problem was not that he did not know about Panasonic parts. The trouble is that the web site often offers multiple part numbers for the same part. Some are just slight revisions, some are actually quite different. Then, the salespeople on the phone arre just sitting in a call center taking orders. In some cases, getting the right part can be a nightmare. Been there, done that.

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Business Telephone Repair