Need help identifying name/part number for leaking coolant (?) hose : Miata(02)

Need help identifying name/part number for leaking coolant (?) hose : Miata(02)

Video Screenshot Gallery: Numir Of Leak

Rear Axle Seal Leaking Dangerous at Henry Lymburner blog
Perkins Diesel Injector Pump Leaking at Mary Reilly blog
Need help identifying name/part number for leaking coolant (?) hose : Miata