Help with Crib Mattress

Mrs. jk3a

I have already purchased the crib, (Koala Taylor collection) from bru. I was at bru today looking to buy a mattress and asked an associate for help because I tried two mattresses in the display and they didn't fit properly (to much room on the sides, I could fit my hand between the mattress and rail) I asked her if she knew what mattress would fit properly and she gave me the standard they all should fit.

Does anyone that has this crib mind sharing what mattress you bought? 

Mrs. jk3a

nevermind I found one