Vacuum hoses...

[Russell T. Neyhart]

    I am about to start replacing the rotted vacuum lines on my QSW.  What
sizes can I expect to find under the hood.  My Bentley manual lists both 3.5
and 4.0 mm I.D. hose at the rear differential.  Are there any different
sizes up front?  I'd like to get a bulk quantity of what I need so I can go
through the whole engine bay while I am swearing at the reverse light switch
(conveniently out of reach right now).
    Has anyone changed the reverse light switch on their 4KQ?  Is it in as
difficult a place to get at as the QSW?
Russ