What type of Weir Door do I need for my pool? My 35 year old pool has 2 skimmers without weir doors. The openings are 1) 7.75" by 5.75" and 2) 8" wide by 6". Centered in the top of the openings is a 1" high by 2" wide metal tab with a 3/16" hole centered in the tab. The guy at the local pool...