hi all,
i've been looking around the net and while the hard plastic, barbed-end vacuum connectors are pretty easy to find, the star-shaped rubber ones which fit around vacuum lines are not. i'd like to buy an assortment of them so i can replace anything at all suspect while testing the branches of the system. the connectors are more likely to leak than the hard lines, right?

here is a recently ended auction which shows the kind of part i'm looking for:
1977 1985 Mercedes 300D 240D W123 Rubber 4 Way and Other Vacuum Connections | eBay

so what's recommended?