I have several New Era Models parts on my Savage. Good quality. Well constructed and to date, nothing has bent or broken.
I would not recommend upgrading to aluminum a-arms unless you intend to only do the uppers. A-arms are prone to taking serious damage and are costly to replace when made of metal. I say to only do the uppers because they are least likely to take a hit from a ground object (which is typically the cause of damage to lower a-arms).
Just some food for thought.
Before you ask...yes, these bulkheads will work with all variants of the Savage from the .21 all the way through the European styled .26 variant. All Savages (so far) have the same chassis design and use the same bulkhead and diff casing parts.