I haven't put the extra cooler on my car yet (and probably won't at this point), but I did put one on my F150. I could not find the right fittings, and the kit I got with it didn't come with them. I cut the lines and put the hose over and clamped it. I should note that it's not uncommon for me to see stock lines done this way after a tranny swap or something, so I didn't feel too bad about it. If I can find the right fittings someplace I would certainly re-do it, just for piece of mind. Actually, what I'd really like ot find are maybe some with a 90 degree bend in them, to furhter ease the curve around to the front of the radiator.
I know the fittings are out there, but I haven't spent a tremendous amount of time looking as of late. I don't mind the rubber hose, but I'd prefer to have the barbed fittings at least, or braided stainless if I could put something together.
Not sure if this was help ... but it was something.