What Mother said is probably the best advice. My Chevy Duty Replacement blocks are. 1+13/16" high x 2" wide x 2+1/4" Length. The length part rests on the top of the frame, then drill hole down the center of the top. The overall height with thin rubber cushions on either side of the block is 2+1/16". You would not want the blocks any shorter than 1+3/4" high because you will have problems getting on the running board splash aprons. Good luck with your project.


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