This is the VKAR Bison running on 4S for a few seconds. I bought this Car for Christmas from Gearbest.com. They sent the car without a battery (which they were supposed to) and the front arm holder was defective. On my first run the suspension hinge Pin popped out and I lost it. You cannot find it from VKAR online but you can go to Helion-rc.com and look for the part under parts for the Four 10 SC truck. The VKAR Bison is the same Car as the Four 10 TR but they do not have the part listed. Also you can get a 3mm stainless steel rod and cut it at 45mm and use that. I hope this helps. Have fun RC-ing!!!