Looking for a Filter

I have come to realize air filters are more complicated to find that what I knew. I have to replace ours and I have no clue if I am ordering the right one or not. I told my husband he needs to double check what I am ordering and for some reason he has more confidence in me than I have in myself. I guess I'll go ahead and place my order and if it doesn't work, then I'll let him deal with it.