Reqired with all Happijac Frame Mount Tie Down applications. For FM and FT-Model Tie downs.Fits: GMC: 1999-2004 Chevrolet Silverado; 1999-2004 GMC "All New" Sierra; 1988-2000 c/k "Classic" (old body style); Dodge: 1994-2002 Ram (Except 2002 Ram 1500); Ford: 1999-2004 F250 HD & F350; 1997-2004 F250 HD & F350; 1980-1996 F-Series (All).The "SB" series stabilizing bar. Provides additional strength to the front anchors and is high recommended with 9-1/2 ft. or larger campers, 4 wheel drive trucks, or extended cab trucks.