I have been working on a mini-alternator mount for my Tiger, not to hard to make with a bit of aluminum and some parts from moroso. You likely could just use the Moroso part with a little work, but it was a little flimsy so I made some changes. It also tucks all in front of the head out of the way.

http://www.gtsparkplugs.com follow the cars link to the Tiger pages and you will eventually find it (Work in progress).