Osram 64193XR-02B X-Racer H4 Halogen Motorbike Headlight Bulb, Double Blister https://www.amazon.co.uk/dp/B0037PZDQ6/ref=cm_sw_r_cp_tai_hcBlzbWJJWY1G
I had these bulbs in my shed for a while now and they don’t fit my bike
I have H7 versions in my bike and they are over a year old and still working
They are similar to night breakers but last a lot longer
They are nearly free
You can have them if you make a donation to Great ormand street kiddies hospital