water pump question, '76B

[Bill Saidel <saidel@crab.rutgers.edu>]

I am in the process of replacing a water pump in a '76B. When I pulled the
pulley for the belts, it came off in 3 pieces, a pulley for the air pump, a
spacer and a pulley for the generator.  In Bentley, Haynes, and in the Moss
and Victoria British catalogs, the pulley for the appropriate year are
illustrated as one piece. 

Are they illustrated incompletely or did the previous owner jury rig the
system? 
(And if the latter, the charging over the year has been great.)
Bill Saidel
'76B