are you talking about the coolant crossover tubes that go under the intake manifold?
i have a stock used ls1 if you want to buy it... 25 bucks shipped if your at all interested.
2000 ws6 - was stock 5.3 pt7675 making 700+rwhp. currently building turbo kit again.... haha
2001 camaro 408, afr 225s, pt88, 4l80e. 880rwhp on 19-20psi 91 pump gas.