Wow. I consider myself pretty knowledgeable when it comes to HID’s but I did not know they made 25w kits.
Either way…you’d probably want 55w 6k for the low, and 25w 3k or 4k for the low beam. Since the 25w is weaker than the 35w, I’m not sure how 25w 4k would look. The higher the wattage, the more the color is washed out (ex: 6k 55w looks like 5k 35w).