I've been using a Gilmour sled base poly head sprinkler. I read online today where I could put a "underground irrigation" type sprinkler on the sled base. I just have to buy some 1/2" threaded connector to connect the sprinkler to the base. I have 2 bases, so my question is what kind of sprinkler should I get that will connect using a 1/2" threaded connector? My front lawn is about 52'x62'.