Upper Transmission Fitting on Radiator

What size is the fitting that goes to the radiator from the transmission. I bent the tube while swapping the radiator, cut it and replaced it with some rubber hose, and now it's leaking more. I'd like to replace it with something like this:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=RUS-610180&N=400081+115&autoview=sku

Except with a bare tube on the end that doesn't go to the radiator (if that makes sense) so I can just put a length of hose between it and the hard line.

Thanks

I don't know the thread, but the hex is a 3/4". I think that would make it a 1/2" NPT thread, I could very well be wrong though.

I used a 19mm...either one probably would have worked. I'll take the part into napa this morning and see what they have.

19mm and 3/4" are interchangable in most situations...3/4" is just a c-hair smaller.