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I have a crack in this hose and my 87 pickup (22ret) is gushing coolant. Its a U-shaped hose with a third connection point at the bend of the U. Photo taken from inside driver front wheel well.
That hose is called the bypass hose, or mid hose. As you have realized, on your turbo engine the hose has a third connection that is not present on naturally aspirated engines. Because of this you may not be able to find an aftermarket version of this hose. I'm not certain of this, but in my brief search I wasn't able to find one.
One place that does have one however, is 22reperformance.com. The one that they show on their website ( http://22reperformance.com/22RE_Perf...ion_Parts.html ) only comes in a kit, but I would recommend calling them to see if you could purchase only that hose (assuming that is the only hose that needs replacement). The guys over there at 22RE Performance are top notch and should definitely be able to help you out.