You can use LCA databases, EPA databases or literature. Unfortunately, the trump administration removed a lot of useful CO2 emissions data from the EPA website. This is disturbing. EU stats are also useful.
This might be of some help. It is from the Australian National Greenhouse accounts. http://www.environment.gov.au/system/files/resources/e30b1895-4870-4a1f-9b32-3a590de3dddf/files/national-greenhouse-accounts-factors-august-2016.pdf