I use these 17smd ones.c.morewood wrote:Any other success stories for 501 sidelight leds?
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I can see why the 25smd ones wouldn't fit.
Try them in the interior lights by your head, see if they're a suitable replacement for them.
Those monodirectional ones you tried should be perfect for the rear number plate illumination.
I posted a couple of pages ago about the 4LED sidelights I tried, which like yours just directed light ahead, they're now in the back lighting my numberplate.