You have to take the old bulb out to replace it. Just take it out and look and see what size it is.
78.5 MM
Honda Accord mk2 (03-08) takes the H1 Bulb Kit
2002 Honda Odyssey brake light bulb lamp replacement: Purchase the correct replacement brake light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement brake light bulb information. Then consult your owner's manual for the replacement procedure. As simple as it sounds, the owner's manual is the best place to start for brake light bulb lamp replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
My 2006 is a 30mm
Low Beam Headlight Bulb Size: 9006High Beam Headlamp Light Bulb Size: 9005
9006
H1
H4
H11
Don't understand what is meant by "light bulb lock."
A Honda Civic coupe has 9003 headlight bulbs