Now I can see the picture, any auto parts store will have a piece of coolant hose to fit that.
Remember to burp the system. I like Peak Global 50/50 premix, that's what I topped mine off with.
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.