What control box do you have? Is it a 4pin or 5 pin.
Tom
Should be able to keep the 2 post ballast setup for simplicity and splice in the elec ign kit per diagrams available online.
There are some on the market to put 2 in, also you could fab up a plate and use 2 small 3" speakers too.
Tom
I picked this one up from a swapmeet a while back.