[Tom Goldman]

SFI spec chassis require weight bar mounts to be a minimum of 1/8" gusseted chrome moly tabs ....A weight box would require a minimum of 2 such tabs on the frame rail or crossmember. .... It is also acceptable to bolt thru a crossmember or frame rail on non SFI spec cars, such as most S/SS classes....Tech guys usuall frown at boxes bolted thru the trunk floor. .....Tom