Summary

Project is a lightweight case for mounting the Retail LM2596 step-down converter available from Amazon.

Edit: New Source
http://www.amazon.com/Retailstore-LM2596-Adjustable-Supply-Converter/dp/B00MEFJXM0/ref=sr_1_1?s=electronics&ie=UTF8&qid=1426553269&sr=1-1&keywords=lm2596