I have three meals & three snacks, did it while losing and still do it during maintenance. I do find that I eat smaller portions at meal times when I have the morning and afternoon snack. That sounds like what you are trying to do - I would say it doesn't have to be meal bars. Anything with a decent amount of protein and fiber as the morning and afternoon snack should do. I used to eat a dry serving of Kashi Go Lean as my afternoon snack. On the bar front, I like Kashi & Luna bars, Gnu Fruit & Fiber bars, I've done Special K bars in the past.
ETA - I should add that a lot of the bars are pretty high calorie. Be careful that you don't eat more than you were before with the addition of the bars. It was easy for me to lose track.