The 67 Skylark convertible and the 67 GS400 convertible were basically the exact same body style. The Skylark had fender skirts.
There was no GS340 convertible.
In '68 the wheelbase actually got shorter. 67 wheelbase was 115; 205" long; shortened to 112 wheelbase in 68; 200.7" long.
Hope that helps!
Ted
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