Locating Stanley bulbs

[TheSmiler]

My indicators have developed a problem with the right hand side flashing faster than the left doesn't bother me really as I don't rely on people noticing them.

Anyway the bulb that is the best out of them all is a P21W Stanley 12V I've tried some cheap bulbs I've got but they keep producing less light and constantly going.

So anyone know where I can get hold of the P21W Stanley 12V bulbs
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CB125>CG125>GN125>ER5>K100RS>R1100RS>K100RS
A2 completed 23/07/15 Ready for the Golden Crisp Packet

[bladerunner]

Just checking but are the cheaper ones 10w or 21w?
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[TheSmiler]