I have a G5 and I put the "Deluxe Solo Seat" from CMW on mine. It's surprisingly comfortable for how thin it is. Any seat that fits the Electra will fit your G5 Deluxe, there is a different mounting bracket for the Electra frame compared to the Classic frame. I didn't like the brackets for the Electra mount, they span between the sub-frame bolt and the shock bolt, because I didn't like the look of the bracket covering up the shock mount. I ended up using the mounts for the Classic frame, turning them around and switching sides with them. They mount to the sub-frame bolt. I also used 2 inch springs, it came with 4 inch springs, to level out the seat so it wasn't high in the back. You can kind of see the brackets in this pic., it's dark.