Help with crossover capacitors


I am re-capping some Altec Lansing 890C Bolero speakers.  They have 6uf/50volt and 3uf/25 volt caps.  What will change if I use 5.6uf and 3.2 caps?  I can't find the exact 6uf and 3uf values.  Should I go a little bit higher on those values or lower?  Any suggestions?  I'm looking at Dayton, Mundorf or Jantzen caps but I'm open to suggestions.

dannybad
Thanks to everyone for the help on this project.  I re-capped the Altec's with some Clarity CSA's, replaced the resistors with Mills (and one Mundorf).  They sound so much better.  I did one and then compared the two and it wasn't even close.  I am now hooked on this hobby.  I have 5 new projects going on with speakers and receivers.  I spend most of my free time reading about all of this.  Is this what happened to all of you?  
Ha! Have fun.   You can improve the sound of all your gear with your skills as you learn! Every piece of gear I own has been upgraded and sounds better than stock.  Very satisfying and fun hobby.