95 chevy dually. what air helper bags work?

I have a 95 Chevy dually that I want to do a 5-7 or 5-8 lowering kit on, But I'm having a hard time finding a helper bag kit that will work with that much of a drop. I looked into the air lift slam air kit but it says it will only work with a 5-6 drop. Any suggestions?

Bell tech LoJack is a bolt on for your truck. Have had them on mine for over 5 years with no issues