I am pretty familiar with the KC cabinet (I assume from the pics on your site that you want the two player cab). Mine is deep in storage, otherwise I would've measured it for you, but if you need to know some detail I'll try to help. I'll be following the thread.
Of the joysticks offered around here, Randy(GGG)'s
Omnistick basic looks the closest to the stock KC sticks, but I haven't played them so I don't know if they have the short/stiff throw necessary (I also don't know if Randy still stocks them as they are out right now). I've played a KC with old Wico leaf sticks and the long sloppy throw of the sticks really changed the character of the game for me. I have an old Ultimarc T-stick plus on my emu cab that has a very similar stiff/short throw to the KC originals, but looks all wrong.
I'm pretty sure you'll want 4-ways and not 8-ways.
Let me know if I can help with anything that doesn't involve unpiling the house worth of stuff in front of it right now.