The actual assembly is adjustable. You have to know all your dimensions as you put everything back together. Then you screw in or out to get just the right clearance. There are a bunch of you tube how to vids.
I need to replace one of the heater hoses that runs to the firewall into the heater core. It's tight back there and before I spend 20 minutes wrestling with it, is there a tool to remove it or is it a squeeze and pull setup? Thanks