What is the stock Width of a 68 camaro rearend?

The stock width of a 1968 Camaro rear end depends on the model. There wasn't a single width. The width varied slightly depending on whether it was a standard or a wider-track version (like an SS). You'll need to specify the model (e.g., SS, RS, base model, etc.) for a more precise answer. However, it generally falls within a range of around 57-59 inches. To be certain, checking a parts catalog or a Camaro restoration resource specific to '68 models would provide the most accurate information for your specific car.