What size should my Bass Case be?

I have a medium scale bass which means i have to get most of my equipment offline since Guitar Center doesn't offer anything for it. It hasn't been a problem until now that i have been asked to play at a children's hospital. My bass is about 45“ and was wondering what size case i should get. I have been doing a little research online and see that most bass cases are about 49” and a full size guitar 39“-41”. The acoustic case seems about the same size but am still unsure. I'm wondering if 4" extra is a big deal or better yet should i just get an acoustic case. Also recommendations for stores other then guitar center will be very much appreciated.

I'll bet that if you called Sweetwater, they could direct you to suitable case. I have gotten a few music items from Sweetwater, and the products and service has always been top-notch.

http://www.sweetwater.com/