This is what I used on our stringers. Judging from your pic, I dont know it would go on the back side. That's a pretty severe gap,imo. Properly fastening the foot of the stringers is the most important concern, but you certainly dont want the upper connect to be floating or just toe nailed. Simpson makes numerous brackets that could work for this application. http://www.strongtie.com/products/categories/angles-clips.html

Here is a link that might be useful: adjustable stair saddle

Could you possibly send more pics. From the current one, it looks like there is some pretty shoddy work there,(blocking shabbily toe nailed), which typically on stairs means there really is not too much of a concern as to whether the stairs will creak or not. There are simple measures and steps you can take to make stairs "creak free" with clean, tight cuts being one of them.

Thank you for you response. These are the only other pictures that I have. The work looks pretty shoddy to me also. The builder is waiting for me to reply about his remedies to the inspection report. All I know right now is that is certainly doesn't seem to me like slapping an L bracket on there is going to remedy the problem. I'm not sure what to tell them beyond that though. http://s1013.photobucket.com/albums/af252/njfootgirl/Stairs/

Here is a link that might be useful: stair photos

If you want help you need to learn how to post photos in your forum message box.

Paste the proper "HTML for Websites" address from photobucket into the message box

or

Go to TinyPic.com and BROWSE til you find your photo on your computer, then click on DOWNLOAD, then click once on the top address line to copy it, then paste it into the message box on the forum.