eBay? 
Thanks, but doesn't help as pump is off and need it to tighten the seal.
Misread the instructions and didn't see the "deep" part.
Halfords don't sell....so I'm knackered.
where are u based pal, have u tried machine mart???
Uxbridge.
Crisis averted....called my mate and is certain he has one.....will get it in about an hour...

Lesson learnt....never assume you professional halfords kit has what you need......
Had to buy a flaming spline set last month.
What's wrong with using normal size
