So, the Custom, the convertible, posted here is drawn at a completely different angle/view, so none of the elements could simply be copied from one drawing to the other. To try to do that would involve so much editing that you would be better off drawing it from scratch.
As far as the actual appearance of the two, the Crestliner was the same car, but with added features that weren't available on the Custom.
Hope that answers your question.
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