- 8" wide 28" tunnel mount base assembly for 2010-2014 Tahoe, Suburban, Yukon, Yukon XL, 2010-2014 Silverado 2500/3500, and Sierra pickups - Includes hump-mount brackets (C-B57 front) (C-B58 rear) - Runs full length of transmission tunnel - Requires no drilling and mounts to existing front and rear inboard seat mounting bolts - The C-TMW-GMC-02 is .625" higher than the C-TMW-GMC-01 in order to properly clear the larger OEM sensor cover in the 2010-2014 vehicle