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If you are talking about the rubber boot at the back of the intake, you can use a rubber boot off a old style coil wire,its a perfect replacement , its thinker then the stock replacement and will not crack , just pull off it the wire, use some lube and slip it in...
If your talking about that little stretch of hose with the intense bend that comes off the front of the intake, I got one at Advance Auto a few months ago. But they didn't have it in stock as a vacuum line. It was some sort of radiator hose. Trimmed about half an inch off and its working great.