I did a small freeze plug on the hole associated with the wire penetration for the center differential that is no longer there. The plastic was brittle and I just deleted it entirely. It has work perfectly so far and looks just like what the factory did for the deletion of the Speed (VSS) sensor toward the front. My concern with the plug is that as the diameter gets bigger, so does the side wall depth. It is a pretty deep recess, but after my experience I like the welding.

I only have a MIG and no gas for the aluminum spoon gun, have yet to try aluminum.

I simply typed "welding near me" in the iphone maps app and started calling the dots that appeared in the order of closest to farthest. It took three phone numbers and $40. Now that the 50 cent plug costs $40.50 is can't possible fail