There is no way my car would be good enough for concours.
Wrong wheels, tyres, air cleaner, diff, air dam, grille below wipers, colour coded axle caps, colour coded grille, extra '6.9' boot badge, but attached to the radiator grille with tiny cable ties, and many various other removeable acessories, like W124 floor mats which I really don't want to remove from take off the car.
I am now considering fittlng an alloy cased air cleaner with twin trumpets, from an R107. It is a very easy fit, you just replace it, using the same fixings in the same place. It's just that the trumpets themselves have to be removed, because the camshaft covers get in the way. Filter gause is just riveted over the air ports left by removal of the trumpets. I think this mod. would only most effective in the colder winter months, because the air inlets are also directly over the exhaust manifolds.
It's MY car, and I like it just the way it is. It just looks and goes better for me.
THAT saves me concours prep., despite the fact that I used to detail new cars prior to delivery to their first owner.