7440 and 7441 halogen bulbs are single filament bulbs. Similarly, 7440 and 7441 LED bulbs have only single function LEDs. LEDs bulbs below 21W (7440) and 27W (7441) may require use of resistors if "bulb-out" error displays on the dash.
BULB TECH SPECS:
7440 halogen bulbs are rated at 21W
7441 halogen bulbs are rated at 27W