83 Spider Intake manifold runner diameters??

[chboro]

New owner of a 83 Spider Veloce, with Bosch FI. I'm going to be replacing a lot of my hoses with silicone ones. All the vacuum lines for sure. Plus, I'll probably replace the intake runners as well, seeing as they look original. Does anyone know the diameters of the intake ports for sure? I have a New rubber intake runner which has a 1.75" ID on both ends. Before I assume the port OD is 1.75" in dia. I thought I would check and see if anyone knows for sure. The object is to order my silicone hose before I take it apart.