I received a mantra plug in harness from ******** that is supposed to plug into the main signal wire coming into the door and then send that to the + and - on the JL crossover. The wires for the BA woofer and tweeter just seem to come out of the main harness.
The BA tweeter with a resistor/diode/whatever on the tweeter seems to filter out the lows.
update - the woofer plug is the main signal output. So I took it straight to the JL crossover input and fed the new JL speakers from there - a few items: used ********s speaker adapters, round the square bottom edges, it fits better and I used hi temp silicone to mount adapters to the door along with 3 screws.
Mounting the new tweeter in the stock housing is simple. Just wrap the edge of the tweeter with VHB tape and set in housing, use some spare plastic or wood to shunt the bottom and push the vhb toward the top, close up with the screw and the back foam keeps everything in place...