[The cap'n]

The boot has reliefs moulded into the holes for the vacuum ports. The parts that are inserted into the ports have a flange, which MUST "snap" into those grooves. Once that's done, a little judicious application of Black RTV, one of the most evil and misused products in the world, will fill any cracks in the area. Reinstall the boot after things have cured and stabilized. The boots are NLA, and used ones are gonna be real hard to find, so take care of the one ya got! The Cap'n