The Toshiba bulbs are virtually identical in every regard to the 9005 and 9006 bulbs EXCEPT for extremely minor differences in the shape of the mounting flanges. HIR bulbs have a double-wide top ear on the plastic bulb base to comply with a law that requires different bulbs to have different bases.  This extra-wide plastic top ear can be easily trimmed or filed to make the HIR fit the bulb receptacle of an 9005 or 9006.  Once the trimming/filing is done, the HIR goes directly into the headlamp and the existing sockets snap on.

TRIMMING INFO

A few minutes work with a file or Dremel tool will greatly enhance the usefulness of these bulbs with regard to those cars which might not, strictly speaking, have been designed with these exact bulbs in mind. In fact, it's amazing how simple and easy it is to remove a few square millimeters of soft plastic. You can even trim them with toenail clippers, (please take a series of small "bites" instead of a big chomp). Five minutes, tops, and then these bulbs will fit in any car that takes 9005 and 9006 bulbs. Owners of certain late-model US cars have reported minor problems, easily corrected, with the shape of the vehicle's light housings. The housings never need to be modified in any way, only the bulbs. Please email if you have any questions about specific fit and suitability factors.