Hi Jeremy,
I assume you're talking about the precut sheet of adhesive that's used to secure the screen normally and are looking for the equivalent to reglue the frame back on the display. Unfortunately I know of no source for any kind of precut adhesive; it's just not a common enough problem that anyone manufactures it for sale.
That being said, your best bet is a tube of glue that you can buy online. There are quite a few available; I'd suggest looking for something along the lines of B-7000 or T-8000. If it was mine, I would probably place the frame on the phone without the precut adhesive, then apply the glue to the frame. Set the screen in place and wrap it with rubber bands or place a weight on it until the glue is dry. After that you can remove the screen, apply the precut adhesive and reassemble. Of course, be sure and test it to make sure the screen still works before gluing it down to the phone.
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