Just done the relay mod for low beam on the vfr, bought some H4 55w bulbs but they don't fit, what Is the fitting?

H4R is standard, I think you have to mod the headlight a little bit, was covered recently in another thread, but I forget which......

they need some modification to fit, the jap spec bulbs have different tab locations to the default H4 bulb.
so either snip the 2 lower tabs to suit, or try and source a pair of UK spec headlamps.

Try this:

viewtopic.php?f=22&t=40182#p293657

Yes. The bulbs need modifcation.

The lower two tabs are in the wrong place.

You can either

1. Cut the lower tabs off and fit re-usbable H4 adapter rings (about 6 quid)



2. Bend the tabs inwards and use a nail to steady the bulb.



3. Dremel the plastic around the headlight to fit the H4 tabs

Not sure about the 30, but on the 35 there's also a small semi-circular notch that needs grinding out of one side of the flange on the lamp by a few mm for it to sit level. Not sure if the adapter rings negate this requirement, I haven't got around to fitting them yet.

Edit: just found this that explains the notch, and also shows the difference in the legs on the headlamps....