^^There is an 89X. Not sure if it's shipping yet, but it's on the site!
Note that if you have an 81/89 or an 81tw/85 type setup, where only one pickup is splittable, you can't switch them without re-wiring; the pin layout is completely different, with the splittable pickups having a 7 pin connector, since it's 2 pickups in one.