General Info Custom Castings For Special Requirements. Cost Effective, High Quality. Since 1984, Southwest Custom Sales has designed and manufactured custom castings for special requirements in most alloys using the casting method most conducive and economical for our customer’s application. As a complement, Southwest Custom Sales is also a manufacturer’s representative for some for the world’s finest foundries, forge shops, fabricators and machine shops. For the past 22 years, we have provided our many customers with the most cost effective and highest quality alternatives, along with on time performance.Call us for a quote on your next project!