Upgrading custom module to support ACL

I have some custom modules that I first created back in SugarCRM 6.x. I’m now using them in SuiteCRM 7.2.1-MAX. The do not appear in the Roles page for setting granular permissions for modules. The ‘base’ modules do, and a test module I created with SuiteCRM 7.2.1. does, but not my ‘legacy’ modules.

Can someone point me in the right direction for what I need to do to have the permissions tool recognize my modules? I do have _sugar.php (extends Basic) with the generic ACL code:

function bean_implements($interface){
		case 'ACL': return true;
	return false;

Which effectively blocks access for all non-admin. I realize I can just return false and have wide open access, but I like the work that’s been done on the security suite and would like to know how to integrate my code properly.
Thank you,