Attention moderators: these final three may be too far in the background to be accepted, but I wasn't sure, so if it's o.k. I'll let y'all decide. I went ahead and submitted them because they're so rarely seen on this particular show.

All three are from episode 3.30 and all are one star vehicles:

1960 Pontiac Safari wagon


1958 Chevrolet (Bel Air?)


1955 Buick (Century?)


...and unless I missed something, that should do it for seasons 1-5.