Two suggestions: www.tracytools.com
- they stock every tap and die known to western civilisation. And prob cheaper and quicker than trying to buy one through the bike trade. Then you'll have it for next time too!
Another tip for cleaning an iffy thread if you've got a spare scrap left hand pedal is to grind two or three flutes down the thread to create a tap and wind it in gently, backing it off every half turn or so to clear it. Use some lube while you're doing it.
EDIT - just read the thread properly and realised you're sorted. Nevermind - Tracy Tools well worth knowing about anyway.
"Any day above the ground is a good day"