While American manufacturers often like to keep design development in-house, historically, they have had an affinity for collaborating with Italian companies for special projects. For one-off hand-built concept cars that require thousands of hours of detailed body sculpting, coach-builders such as Carrozzeria Ghia and Carrozzeria Pininfarina remain unmatched for bringing design dreams to reality.

Simultaneously, fashion design houses such as Gucci are occasionally trusted with fabricating ultra-luxury interiors for special edition models. Successful or not, these collaborations made for some unusual and unforgettable pieces of automotive history.