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You should be able to spot a rib based on where the rivets hold the aluminum to the inside walls. Unless your rig has wallpaper or the foam or cloth that is in some units. A 71 should have the rivet lines in plain view.
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Brett G
WBCCI #5501 AIR # 49
"Stop worrying about the potholes in the road and celebrate the journey." -- Fitzhugh Mullan
Wise men talk because they have someting to say; fools, because they have to say something. -- Plato
In politics, absurdity is not a handicap— Napoleon
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