The Chevelle unit and Camaro unit both use the same A226CW filter. The cowl plenum shown in your post at the top of this page appears to be a repro which uses the more commonly available 17" diameter lid. It has a rubber seal in the outer groove whereas the real cowl plenum lid is 16-3/4" in diameter and does not have a rubber strip for sealing to the base. The "697' filter will fit with the larger diameter lid because it was designed to use that filter in the first place. The larger diameter lid is used for the repro because it looks close enough that most people don't catch it, uses a commonly available filter, and means there is one less piece to have to tool up to get made.
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