New drivers in old boxes?

I have a pair of Epicure model 3's that still look pretty good. I always thought the box was an intelligent design for its time, a narrow front baffle that widens at the back with rounded corners and a raised base ported at the bottom. This back in the late 80's. drivers are 8"w 41/2"m and a 2x4 tweeter.

Any diy'ers that could recommend drop in replacement  drivers?  I was on the human website and want to keep looking for solutions. tia Steve