This is the adjustable front wheel mount for Mopit 3, 4, 4.5, 5, mini, Mid (Gen1), MAX.  Each machine uses two of these.  This is for one single unit that has been assembles with the wheel adjuster mount, slide, stainless steel bolt and washer.  

To repair this part on your machine it can be labor intensive.  If you'd like further details on how to install this part, please call our technician at (800) 290-2833.