Those are the original keys, they match the one I have. My replacement key is a squared off key that was cut at the dealer using the code number on the original key.

Same here My Z has those same round keys and they are original and I don't have seperate keys for the hatch and doors. The one key works everything

Looks like somebody else got it and is now listing it,

http://cgi.ebay.com/ebaymotors/Incredible-1978-Datsun-280Z-California-Survivor_W0QQitemZ360030885037QQcmdZViewItem?hash=item360030885037

Anybody know by chance what that thing is that is sticking up on the side of the bumper?,

Every seller advertises it as a 1 owner car...... I count 3......

Anybody know by chance what that thing is that is sticking up on the side of the bumper?

CB antenna mount, perhaps?