same style, or exact same style and length?

edit: noticing some of my posting earlier was wandering into strictly singlespeed talk. Honestly, you already have your 1x bike, just remove the parts you don't want (front derailer and cable- or just leave them on and never touch them) and replace the worn parts (rear wheel, derailer). 1x7/1x8 parts are super cheap, even a new pair of integrated shift levers are dirt cheap on ebay these days.