I am just doing some preventative maintenance. The cheap tie down straps for the propane bottles are rusting, and I am making some heavy duty replacements. Unfortunately our RV is in storage and I can't take the measurements myself, but the existing straps are held in place in the propane cupboard with two sheet metal screws drilled through the strap holding it to the back wall of the cupboard. Can someone measure the distance between the two screws on one of the straps?