Squat Rack Attachments. From mag pins, spotter arms, to dip stations, to J-cups and more, we have all of the squat rack attachments and accessories that you need. Add more kick butt exercises to your workout with more attachments like the new Mammoth Belt Squat. Need 2x2 rack attachments? 2x3 attachments? Or 3x3 attachments? Get the full body workout you know you want and need.