Timing belt question

[Richard Romero <raromero@bu.edu>]

I am about to change the tb on my 86 5ks with guidance from my audi 
mechanic friends.  They say in addition to the tb I need a new valve 
cover gasket, crank seal, cam seal, and water pump gasket (will probably 
change the wp) to ensure no leaks.  The tb on the car has about 85k on it 
and on visual inspection the teeth look fine but the belt has very fine 
cracks on the outside.  Question- should i replace these seals and gaskets?
TIA

Andrew Romero