The upper goes to the forward hole. The aft lower goes to the aft hole. Most of the Tempests were later equipped with a jackstay which went from the forward side of the mast near the spreaders to the forward end of the cabin trunk. They did this because in going to weather in a bit of a swell the mast would start to buck forward & back and break at the spreaders. Most of the tempests in our club retro fitted the boats with double lowers. We installed chainplates forward and aft of the current chainplate by about 12-16 inches. This solved the problem and nobody lost a mast since. I have had that on my boat since 1968.