As far as I know, I am the ONLY one making a stacked hum-canceling J pickup. All the others are either 2+2 or 3+2. The 2+2 cancel 100% and will drop in as a replacement in any Sadowsky bass. I have gone away from the 3+2 for 5 strings as they only hum-cancel about 75% and are susceptible to noise interference. We now offer the stacks in both a 5 string and 4 string design and they can be wired with a true coil cut switch. However, because they are significantly deeper, they will only fit on recent NYC basses without deepening the routs. All MetroLine, MetroExpress, and older NYC basses need the routs deepened.