I'm going to perform these xover upgrades myself.

Well, at least the caps. What's the motivation for changing resistors? Typically age should not be a concern, right?

I replaced the crossovers in my Klipsch Forte IIs (1990), as I posted in the other thread, with new Bob Crites xovers, and the Fortes now eclipse the 19s in some ways. The change was pretty amazing.