Here in North America they are known as a "linch pin" or "PTO pin". They're simply a locking pin with wire retainer. I've been meaning to do mine since I built the car...one day I'll get to it!
http://www.mcmaster.com/#linch-pins/=kwoicm
-Dave
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'71 Type 1 - Rally Project
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'75 Type 1 - Family Heirloom
'93 Chevy 3500 pickup - Cummins Swap
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