Figured I would make this write up as this is something I ran into recently. I'm sure others could use this as well. Customer came in to have some work done. Had a NA to TT conversion that was done locally by someone. It was a real hack job to say the least. One of the items he was having me do was install his fan shroud as his old one was torn up. Once I got in there I found a problem. His TT radiator was just sitting there not being held in place by anything. This allowed it to tilt and shift side to side enough that the fan blade contacted the fan shroud destroying it. So I had to fix this issue before putting a new
shroud on.When I do conversion I remove the Na mounts and re-weld them in the TT location. Being this conversion was "done" already I wasn't looking to tear a bunch of stuff apart in order to do that. Z1 makes a conversion bracket but it will not work with a stock TT radiator, you must have an aftermarket radiator. I happen to have one of these on hand. It appears it wouldn't take much to mod their design in order to have it work with the stock TT radiator. I'm not sure if they have looked into this or not.
 Z1 NA -> TT Lower Radiator Conversion Bracket. Here is what I came up with. I had all these parts laying around already but they are easy and cheap to get. You'll need a section of aluminum channel. I got this at home Depot years ago so I had a scrap piece laying around. Ignore the holes in it as they were from a previous project. I believe it's 3/4" wide. 
You'll need a section long enough to fit in the channel in the bottom of the stock radiator. The section I had was just long enough. I would have like to have used a tag longer section if I could have. Once cut to length you want to take a mallet or hammer and slightly pound the sides so they angle in towards the center. Don't need to do this too much. You can kind of see this in the picture above. Once done, you'll want to place the channel into the bottom of the radiator. Give it a few taps to make sure its in all the way and tight. 
Once in place you'll want to mark the 4 inner holes that are in the radiator all ready (2 on each side of the channel). Once marked, remove the aluminum channel and drill holes where you just marked. You'll want to drill them based on what screws you plan on using to mount the channel. I had some laying around I used. You'll want to use something with a low "pan" kind of head since the shroud will sit on stop of it when done. There is a picture later showing this. Here is the screws I used and you can see where they go as well. 
Once installed you'll want to mark one side so that you put it back on later the same way. I put a P for passenger side (looks like a D because I was in the hurry). 
Now that you have a base mounted, you'll need some pins or studs for the radiator to mount with into the stock rubber mounts. Again I had some scrap. This is a 3/8" aluminum hollow rod. I got this at Ace Hardware years ago. 3/8" fits the stock mounts perfectly. I cut 2 sections off, 3/4" long. 
Then you need to thread/tap the inside of the rod for a bolt. I used some Z bolts I have laying around in my Z bolt bin. I couldn't find my tap though. The aluminum was soft enough that I just used the bolt to create the threads. I just simply threaded it into the rod with a wrench and it
worked. If you can find some pre-threaded rod I would get that and get the bolts that match it. Easier and quicker if you are out buying this stuff anyway. 
Then you have to do some measuring and math. TT radiator mounting studs are 24" apart far side to far side. Take the TT radiator with the channel installed on it still and using a tape measure find the middle between the studs (12") and mark it. This is where its important to have
the channel mounted and a side marked so you can put it back on the same way. Once the middle is marked we need to measure for the NA radiator mounts. They are about 14 5/8" center to center. So half of this is 7 5/16". 
So now going back to your center mark on the aluminum channel, mark out 7 5/16" on each side. This will be where you will drill your holes for the mounting bolts to pass through. Once marked, unbolt the channel and drill your holes. Install the bolt and thread on the aluminum rod on each side. Then reinstall the aluminum channel onto the radiator (the same way it came off). 
You can even reuse the lower radiator hose holder. Just need to drill a hole on the bottom of it for the radiator mounting pin to pass through. 
Then mount the shroud. 
Here you can see how the shroud sits on the mounting screws for the channel you installed. This is why I used screws with lower profile heads. 
Then install the radiator and you are good to go. 
Everything fits and works as it should. Top mounts go on just at they should as well.
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How to convert a TT radiator to use Non-turbo mounts. - 
