Your observation about seeing more 1956 models is likely because:
* Conversion Numbers: More 1956 Chevrolets might have been converted to RHD than 1957s. The volume of conversions varied year to year depending on import numbers and local demand.
* Availability of Parts: Converting a car requires parts, and finding the necessary components for a more complex conversion might have been easier with the slightly simpler (though still complex) chassis of a '56.
* Preservation: Older vehicles are more likely to have suffered damage or been lost over time. A surviving '56 RHD conversion might simply be a matter of chance in terms of documentation and preservation efforts.
To find information on your specific query of a 1957 RHD Chevy, I would suggest these avenues:
* Online forums and clubs: Search for Chevrolet forums, particularly those focused on classic cars and Australian or UK automotive history. Enthusiasts might have information on specific conversions, including photographs and details.
* Specialized automotive archives: Check with national archives or motoring museums in countries known for RHD conversions (Australia, New Zealand, UK). They might possess records of vehicle importations and modifications.
* Local historical societies: If you have a location where you saw the cars, local historical societies might have records or photos of RHD Chevrolets.
Keep in mind that proving a specific 1957 Chevy was converted to RHD will likely require detailed documentation or unique identifying features visible on the chassis or bodywork, beyond just the steering wheel location.
