I will try to measure those bushings for you this weekend.
So I am trying to work out my new coolant system. I am deleting the coolant ball and instead running a filler neck with a coolant catch tank. I was previously running my turbo coolant lines from the lines that used to go to the TB heater. I am looking for a way to clean this whole thing up and will be running -6 stainless braided lines for my turbo feed/drain. I am also looking into running the IE billet heater core fittings but stopping down from a -10 to -8 from the IE SAI blockoff plate to the heater core feed. It seemed like my old setup didn't have the best flow and my coolant would boil a bit in the expansion tank sometimes. Where is the best place to tap into for the turbo feed? would right between the block and the heater core work well?
Here is a diagram.
Also I am not sure how to go from the AN hose on the heater box outlet to the t-stat housing.