If the screw locations are non standard you're not going to find a case that it'll just fit, grab a drill and put new holes in where required, or if you're unlikely to need to take it out often, you could use adhesive standoffs if it's only a couple of holes that don't line up https://www.amazon.com/Standoff-0-18-Adhesive-Package-Quantity/dp/B01MG5SLUZ/ref=sr_1_19?ie=UTF8&qid=1491950547&sr=8-19&keywords=standoff+adhesive