Profile: Shamrock Plastics Inc. supplies custom vacuum formed parts to the local market. We specialize in parts for vehicle interiors and intricate pressure formed parts for the food industry, large covers for dumpsters & many other applications. Our back panel consists of two formed parts, sonic welded together and sealed with silicone to form an air plenum for air conditioning. Our lamplighters are decorative covers that simply fit over existing yard lamp or coach lights.