brake booster

["James E. Pickard" <geowiz@cox-internet.com>]

When I acquired my Tiger it lacked the brake booster.  I'd like to reinstall
one to return it to the stock appearance.  Not being the world's best
mechanic, what pitfalls do I need to know about?  Does it take anything
special besides money?  Any instructions on how to do it?  Best source for a
stock unit?  What other pieces do I need?  Didn't they come in two sizes?
What is the correct size for a Mk I?  Any other words of wisdom?  Thanks in
advance.

Jim Pickard
Lafayette, LA