Rubber Vacuum Line Connector Kit?

I don't think there are kits for these, you might want to get alot of the rubber vacuum hose and just cut them to desired lengths. As for the connectors ("Y" and "+" ones) just get a set of them, depending on how much you want to change. If you're redoing the entire engine go for around 5 each, that way you have enough for spare if any decide to go. I would keep the little plastic color-coded ones though! Clean them inside out while you're at it.

EDIT: Mercedes Source has a kit but only includes a few items...just watch out for his prices

The black vacuum hose itself is a common item available at wal-fart or advance auto- but the j, y, and u connectors as well as the + can be had for small change at the dealer. Don't go wasting your time ordering them online when you can get them cheap enough down the road at MB.