First, I don't know the screw dimensions without taking my phone apart again and measuring them... Wish I'd have thought of that while it was apart.

Now, you say they are stripped. Are you talking about the torx head of the screw?

If not, I suspect that the screws themselves are not stripped. Are you SURE that it's not the screw HOLES that are stripped?

I would think that would be more likely since the screws thread into plastic. If that is indeed the case, new screws won't help. I can't remember if some of the screws thread into brass inserts.

If it's the plastic that the screws thread into, I would suggest rebuilding the holes by carefully using a drop of glue/epoxy/something to get the screws to cut new threads.

Just a thought...

 

I don't know how you could get that piece, unless you could get a bad/broke Triumph from the 'bay or here... great way to get parts if you can find one cheap enough.

 

If I can't fix my phone, I can send you some of the screws off of mine if you want. My digitizer or something went bad and I just had it apart so I know I can get them out without messing them up. Where are you located?

 

Pretty sure what thangfish was asking was "did you strip the head or did you strip the threads". Sounds to me like you stripped the head if you had that much trouble getting them out, if you'd stripped the threads they would virtually fall out on their own, or just require you to pry on the reverse side of the head as you turned them.
What kind of driver were you using to get them out? The head on those are a T6 IIRC. When I took mine apart (to resolder the charge port shell) I had a T6 but not a T5 to remove the inner screws so I used a couple of jeweler's needle files to make a T5/6 hybrid, filing down multiple splines of just the very tip, as I still needed the T6 to reassemble it.
(the point there is if the driver you were using fit the inner screws and you used it on the first two outer screws, that's what did it. It was too small and they are in fact two different sized heads)

 

it's a t5. I just opened mine yesterday.