Good morning!

I am having trouble finding the correct diameter coolant nozzle to fit into the block on my HL-2. I tried what I thought was the right ones from MSC, but I have failed twice. Does anyone have any insight on where to purchase or what exactly to look for? I attached a picture of what exactly I am looking for (on the left) and what I tried to purchase (in the 2 packages to the right.) Any help would be appreciated!

Thank you.