90 Ls400, Power Steering Pump, Part 2

Hi -
A while back I ask about a noisy power steering pump and if failure was 
immanent.  Well I decided to pick up one off eBay, just in case.  Although

it generally looks in great shape it was NOT packaged very good, and
arrived 
with both nipples broken off the valve ( RE:
What I bought: http://i3.ebayimg.com/08/i/000/c4/b1/fdaf_12.JPG
 What 
arrived:  http://pages.cthome.net/jerohm/LS400%20Pump%20001a.jpg
).  
Let's 
suppose the power steering pump currently installed IS BAD.  What are the 
chances that I could STILL use the currently installed valve?  If NOT, is 
this a ridiculously expensive part?  i.e., How much?  Should I cause a fit

with the seller, or just deal with the situation?  Thanks, as always.
j