As do the factory crossover boxes,

As do the factory crossover boxes, the Pass-based charge-coupled crossover PCBs that I sell mount directly to the holes in the floor of the cabinet. (Ask me if you’re interested in the PCBs.) The work with the stock L pads. I’m including my notes on that crossover, the boards for which I sell on eBay. The boards include an option to let you break the woofer input off from the upper inputs (you’d need two pairs of input terminals on the back).The best source for grille cloth is Huntley Audio (Steve Barnes) on eBay; he sells cloth virtually identical to the original, but in many more colors.The easiest way I’ve found to install the grille cloth is to mask off the frame then spray the attachment surfaces only with 3M 90 contact cement, let it dry, then clamp and iron on the opposite corners first, then the middles of the sides, then the edges. Never pull the fabric too tight or it will bunch and wrinkle. Don’t worry about pulling the cloth edge into a perfect line; instead trim it with a razor blade.