Shape specifications axial lead resistor
If the information is not in the datasheet and there is no reference to a specification such as a MIL standard, it's not controlled. 

If you want the information to create a 3D solid (eg .stp) model, you can just eyeball it, use calipers and radius gauge set off a sample.




It's only for appearance as the manufacturer only guarantees what is in the specs and datasheet. There is no guarantee the manufacturer won't change the diameter of the ceramic tube or end-cap dimensions or lacquer viscosity so long as the datasheet dimensions are not violated (which usually means it fits within a specified cylindrical outline, and no specifics as to what happens within that envelope). 

It's not uncommon to have more than one factory supplying parts with the same part number and the same manufacturer, with completely different tooling.