Used Dunlavy V's - what if they 'break'

Hi guys
i've been doing this hobby for 30 yrs, and a confirmed 'planar' person for nearly all of it. You name it, i've had it...and ususlly enjoyed it.
I had a chance to hear a pr of Dunlavy V's a year or so ago and was amazed at the sound. Granted the system preceeding the V's was extraordinary (Dynavector,Continuum, Boulder, MacIntosh), but i still came away in wonder at how a pair of dynamic speakers could be so coherent, transparent and life like. My speakers at that time (and until recently when my wife made it clear that they had to go to storage) was Infintity IRS V's. I love the IRS but i can't use them without adding a new room onto the house. so in substitution i am looking to buy a pr of used Dunlavy V's. Sorry for the long winded intro.

My question is what happens if you blow a driver? i know the drivers are still made but Dunlavy carefully selected each driver for each individual speaker and then custom tweaked the XO to totally optimize each individual speakers response. so i worry that just buying an off the shelf Vifa driver won't match the rest of a given speakers drivers without re-tweaking the XO values.
Didn't Dunlavy set aside spare drivers for each speaker he built (for each serial#)? if so does anyone know what happened to those componenets?

I would greatly appreciate your thoughts on this as i think the V's will be a great speaker to get me over the IRS blues.

thanks