need advice on radiators..
 

Ok guys. Just answer my question and feel free to flame me..

Anyways, today my radiator on my S5 Coupe started leaking hard-core so I believe it needs to be replaced. Heres the skinny, I have a 10th Anniversary and figured that possibly I could pull its radiator and put it on my S5. That could all happen if they are interchangable between series? Then to kill two birds with one stone, I would buy a Koyo for the 10th AE since I plan on eventually doing that. My other option would be to buy a used radiator for the S5 and get it cleaned out then put that on and just keep the AE like it is.
Now, what would you guys do?

I would upgrade if u got the cash. If not I got a rad I'll sell u cheap.

I'd only have the cash for one aftermarket rad. and I think since my S5 is stock that a stock radiator would surely be enough. I guess my question is, will my S4 T2 radiator fit on my S5 coupe or not?

nah, it won't work unless you swap the S4 waterpump and filler neck as well. otherwise, there's nowhere to fill the system. lol. :D

On the 88 the fill point is on the radiator just like the s5 except location. My only concern if the mounting points are the same. Can anybody clarify this?