**This carb has a JD Jetting Kit included with instructions for you to install.** This is a GREAT deal, considering competitive carbs at a cost of twice as much or more! This carburetor measures 171.6mm top to bottom and 92mm front to back. Be sure to measure and make sure it fits before you order. We do have the JDKH38 that are dimensionally smaller, but still provide the 38mm performance if you need a smaller fitting carb.