International 8600 TranStar high beam and low beam headlight bulbs both use 9007 bulb size. The replacement chart covers 2008 to 2018 vehicle production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 8600 TranStar uses the 9007 bulb size for both high beam and low beam headlights across all listed model years from 2008-2018.
The 9007 is a dual-filament halogen bulb, meaning a single bulb contains separate filaments for high and low beam functions rather than requiring two distinct bulbs per housing.
Because the 9007 serves both beam functions in the 8600 TranStar, the high beam and low beam positions draw from the same bulb type, which simplifies replacement parts inventory.
The 9007 bulb operates on a standard two-filament design rated at 65 watts for high beam and 55 watts for low beam output.
The 9007 uses an HB5 base configuration, which is a specific connector type not shared with other common dual-filament bulbs such as the 9004, making cross-substitution between those types incompatible without modification.
The 9007 and 9004 bulbs are physically similar in appearance but have reversed polarity wiring, meaning a 9004 installed in a 9007 socket would produce high beam output when low beam is selected, and vice versa.
Aftermarket 9007 bulbs are available in halogen, LED, and HID formats, though socket and housing compatibility varies by replacement type and the original housing design of the 8600 TranStar is built around halogen output characteristics.