Wrong size.
They do, however, fit various other internal and external lights. On the GS, for example, they fit sidelights, rear interior lights, red footlights, boot light, high-level brake light, number plate light, side repeaters and the outer tail lights!
They're probably fine as sidelights, it's just that I've already got my LED ones in there.
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Bloody hell! How many lights does the GS have in it!? Sounds like there's quite a few uses for them then :D Are LED lights substantially better then?