P38A Coolant hose leak

Hi guys, after changing the water pump and header tank, the small pipe that connects underneath the expansion tank at the front, think it's the plenum bleed pipe, has decided to let go. Any ideas where I can find a replacement? My google-fu is letting me down on this one!

Thanks
Edit: forgot to say it's a 98 4.6 gems

That looks like the wee beastie, thanks for your help. Found a diagram on Google which pointed to the plenum, how strange!