i've got mx-3 rears in my car. you've got to use the brackets from the escort seat back on the mx-3 seat back. they just slide off of one seat and back onto the other. the clips for the seat bottom are different, and you cant swap brackets from one to the other. i'm not really thrilled with how they fit, i havent decided if i'm gonna leave them or swap them back. if you need pics i can try to take a couple.