DYI upgrading B&W N805 to Diamond 805?

I am now debating whether to attempt this at all, to me, just upgrading caps at random without thinking of what the design and measurements at B&W WITH original Caps were meant to achieve, is not wise. I may make things worse.

Now, how do I find EXACT SAME spec caps, which wouldn't really change the design parameters and do an upgrade like that?

By the exact same spec we mean same resistor ohm and wattage values and capacitor uf values. These are printed on the parts and can also be measured with a simple multimeter. You are replacing film caps so no real ESR issues to obsess over.

Alex,
  I provided a link in my above post to get the manual for the N805 which shows the cap and resistor values. Here is a copy from the page:

    1) LF Crossover

R1 5R6     11W   Ceramic Wirewound    BENNIC Resistor
C1 6u8    250V  Polypropylene             ICW
L1 1.45mH         small air core


   (2) HF Crossover

R1 3R3     11W  Ceramic Wirewound    BENNIC Resistor
C1 4u7    250V Polypropylene             ICW
C2 10uF  250V Polypropylene             ICW
L1 0.15mH        small air core

Great info sherod! I would still take actual part measurements to do this job right. Looks like a simple and fun project OP. 

When I pulled the factory caps and resistors out of my N805 speakers, they matched exactly with the values from the manual.