GFCI with Aluminum?

Are these things generally legal for installation into a kitchen counter area? I'd like to replace an old receptable (2 prong) with a GFCI outlet. This outlet will also be protecting one downstream outlet. The present box is not deep enough to hold the GFCI due to what appears to be nails running thru the box to (I assume) the stud. In all truth the best thing is to replace the box but I really didn't want to rip out part of the wall at this time. Thank You wes

I am helping a friend run an underground electrical line to her guest house. The contractor who built her main house ran 1 1/4" PVC about half way and ended at a stub out. I want to continue the conduit to the guest house and bring it up to a subpanel. When I looked in Practical Electrical Wiring I noticed a diagram showing an "expansion fitting" where the PVC conduit comes out of the ground and connects to a structure. The text says this is important to relieve the stress on the junction box from differential thermal expansion between the PVC and other builiding materials to which it is attached. The problem I am having is that since I live in southern California, even the guys in the electrical supply houses look at me like I am from Mars when I ask if they sell expansion fittings for PVC conduit. I guess they are not generally used around here, but my friend's house is located higher up in the mountains where it does freeze and even snow during the winter. The book also mentions using an elliptical hole to allow for expansion, but since mice are a big problem in the area, I would rather not make it any easier for them to get into the structure. I like to do things as much by the book as possible, but I feel stymied since no one else I have talked to seems to care, or even know about expansion fittings around here.