AMS 4218 Spec, Equivalent

First off let me apologies for posting this question here I am not sure if it belong on this thread or even this form. Hopefully someone will know the answer and be able to help. I have a cast aluminum part that we want to make for bar stock. The cast material specification is AMS 4218, can anyone tell me the equivalent or closest specification for bar aluminum?

Thank you for any help,

You can try this web-site www.uni-cast.com/alloy.htm
You may need to google this site to get to the page.