I added them to my Model III. No special reinforced bosses required. I used fuel tank grommets from JBM Industries like these: JBM Industries Fuel Tank Grommets.jpg
The tubes I used the Ethanol proof blue Bing fuel line, even though I don't use Ethanol gas. The barbed 90 deg fittings can be found at lawn equpment businesses or online. A brass wire inside helps keep the tubes straight. Installed the grommets and fittings with a little dielectric grease. I also safety wired the site tubes so they can't slip off. The placards were printed on vinyl and applied to aluminum sheet cut out to fit.