Power Plus headlights burn brighter so you can see up to 25% farther than on any conventional high beam. Sealed beam construction. Legal in all 50 states and Canada. Direct replacement for standard headlights. Easy installation. No special wiring needed. No. 18522: 4-lamp, high, round, 5-3/4'' in diameter No. 18523: 4-lamp, low, round, 5-3/4'' in diameter No. 18532: 4-lamp, high, rectangular, 6-1/2'' in length No. 18533: 4-lamp, low, rectangular, 6-1/2'' in length No. 18525: 2-lamp, high/low, round, 7'' in diameter No. 18534: 2-lamp, high/low, rectangular, 7-1/2'' in diameter