Keith Alderman had one for sale recently, in the UK. Might have even had a cap and tap. I don't think it sold, but it's not currently listed. Keith's eBay shop is
Motolink Yamaha Spares, and his eBay name is 'crazygore'
There is a tap on eBay now (not from Keith): http://www.ebay.co.uk/itm/YAMAHA-TZ-...AOSwONBZExj F