Dunlavy VI Crossover Upgrades

I'd like to upgrade the crossover network on my Dunlavy VI speakers. I can't seem to get the back panel off the speaker. Has anyone out there done this successfully? I am seeking advice on how to get the back panel where the binding posts are, off, to access the crossover.

Also interested in opinions about what capacitors to use (Audionote, Auricap, Hovland, Sonicaps).