This is the wheel I have and was hoping to use - thanks for the tip as to where to place the limit switch.
Houkr GT2 Aluminum Timing Belt Idler Pulley Bearing 20&60 Teeth Width 6.35mm Born Synchronous Wheel, with a Length 200mm Width 6mm Belt and a M4 Allen Wrench, for 3D Printer. : Amazon.ca: Industrial & Scientific