I got a couple of 45s (marcy) places that have handles. They are a tad smaller then my other regular 45lb plates but feel the same weight. Is marcy plates usually a little smaller?
Overall though it's a good idea to stick with one line of one brand of plates (meaning always use not only the same brand but the same model of plates when possible).
The marcy's are probably only good to within a few pounds.
Put the larger ones on the inside and it will make it easier to load and unload the bar when it is on the ground as you will be able to slip the Marcy's on and off without them dragging on the floor.