Redline had a kit in stock and, as usual, it was with me within days.
With a little time and care you can fit yourself (although I cheated and asked Dave Andrews to help, OK - do it, whilst he was rebuilding the engine anyway) but the lessons learned were to be very careful to get tight seals on the tank itself as they're very difficult to get at once in. Loop an alternator belt over it too.
And there's a lug on the engine block right in the way that has to go too. Lots of info on here if you search.
Big for Redline.