The New Style UVinex Lamps and Transformers will not work with the old style 4 Prong Lamps and Transformers.The New UVinex Lamps have 2 prongs on one end and are coated with a special plastic sleeve which avoids the fragile quartz sleeve. For the retro brackets - Side is determined by standing behind the skimmer and facing the pond. Screws are not included
