Nice crank. As Bill pointed out that spindle should not be too hard to find. However there were differences in the Campi spindles. Post the information from the back of the spindle and check Vintagetrek.com and see what year your 660 is from so you can get the correct spindle. Also the style of the cups has abit to do with it.
As for the missing Jockey pulley (the upper pulley is the jockey since it moves the shain, and the lower is the idler since it keeps tension) should be easy to replace as well. If the RD is good shape you may aswell get a set then you can keep the one you have as spare.
Check ebay and at Oschner International for you spindle and pulleys. Also look at VeloBase to help you figure out just which one you need.
http://velobase.com/
http://www.ochsnerusa-store.com/
http://vintage-trek.com/
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk