im buliding a new back half of the sled and am sticking with 162 but going to a 3 inch . the tunnel is just too nice to send rolling down a hill . i have a ton of offers already . the tunnel has the external m10 plates that are polished . i dont know what skids will work with the tunnel other than the cr10 . the tunnel is set up for a front mount , to get a rear mount on all you have to do is cut the hole out