I have an Ibanez Roadstar II bass. A RB650 to be exact. I got it from my uncle when I was younger and the original hard case was too heavy for me to lug back and forth to my so my dad got me a soft gig bag. I really want to get a new hard case for it now though. Do I need a specific case for my bass or is their a certain standard that it will fit in? I don't think we have the original case anymore. Thanks in advance.