diff --git a/selfdrive/controls/lib/sunnypilot/custom_stock_longitudinal_controller/car/hyundai/controller.py b/selfdrive/controls/lib/sunnypilot/custom_stock_longitudinal_controller/car/hyundai/controller.py
new file mode 100644
index 0000000000..a00fba0c84
--- /dev/null
+++ b/selfdrive/controls/lib/sunnypilot/custom_stock_longitudinal_controller/car/hyundai/controller.py
@@ -0,0 +1,67 @@
+from cereal import car
+from openpilot.selfdrive.car import DT_CTRL
+from openpilot.selfdrive.car.hyundai import hyundaicanfd, hyundaican
+from openpilot.selfdrive.car.hyundai.values import HyundaiFlags, Buttons, CANFD_CAR, LEGACY_SAFETY_MODE_CAR
+from openpilot.selfdrive.controls.lib.sunnypilot.custom_stock_longitudinal_controller.controllers import CustomStockLongitudinalControllerBase, \
+  SendCan
+
+ButtonType = car.CarState.ButtonEvent.Type
+SET_SPEED_BUTTONS = (ButtonType.accelCruise, ButtonType.decelCruise)
+
+
+class CustomStockLongitudinalController(CustomStockLongitudinalControllerBase):
+  def __init__(self, car_controller, CP):
+    super().__init__(car_controller, CP)
+
+  def get_set_speed_buttons(self, CS: car.CarState) -> bool:
+    return any(be.type in SET_SPEED_BUTTONS for be in CS.out.buttonEvents)
+
+  def get_button_mappings(self) -> dict[str, int]:
+    btn_mapping = {
+      'type_1': Buttons.RES_ACCEL,
+      'type_2': Buttons.SET_DECEL,
+    }
+    return btn_mapping
+
+  def create_can_mock_button_messages(self, CS: car.CarState, CC: car.CarControl) -> list[SendCan]:
+    can_sends = []
+    if not (CC.cruiseControl.cancel or CC.cruiseControl.resume) and CS.out.cruiseState.enabled:
+      self.cruise_button = self.get_cruise_buttons(CS, CC.vCruise)
+      if self.cruise_button is not None:
+        if self.CP.carFingerprint in LEGACY_SAFETY_MODE_CAR:
+          send_freq = 1
+          if not (self.v_tsc_state != 0 or self.m_tsc_state > 1) and abs(self.target_speed - self.v_set_dis) <= 2:
+            send_freq = 5
+          # send resume at a max freq of 10Hz
+          if (self.car_controller.frame - self.car_controller.last_button_frame) * DT_CTRL > 0.1 * send_freq:
+            # send 25 messages at a time to increases the likelihood of cruise buttons being accepted
+            can_sends.extend([hyundaican.create_clu11(self.car_controller.packer, self.car_controller.frame, CS.clu11, self.cruise_button, self.CP)] * 25)
+            if (self.car_controller.frame - self.car_controller.last_button_frame) * DT_CTRL >= 0.15 * send_freq:
+              self.car_controller.last_button_frame = self.car_controller.frame
+        elif self.car_controller.frame % 2 == 0:
+          can_sends.extend([hyundaican.create_clu11(self.car_controller.packer, (self.car_controller.frame // 2) + 1, CS.clu11, self.cruise_button, self.CP)] * 25)
+
+    return can_sends
+
+  def create_canfd_mock_button_messages(self, CS: car.CarState, CC: car.CarControl) -> list[SendCan]:
+    can_sends = []
+    if not (CC.cruiseControl.cancel or CC.cruiseControl.resume) and CS.out.cruiseState.enabled:
+      if self.CP.flags & HyundaiFlags.CANFD_ALT_BUTTONS:
+        # TODO: resume for alt button cars
+        pass
+      else:
+        self.cruise_button = self.get_cruise_buttons(CS, CC.vCruise)
+        if self.cruise_button is not None:
+          if self.car_controller.frame % 2 == 0:
+            can_sends.append(hyundaicanfd.create_buttons(self.car_controller.packer, self.CP, self.car_controller.CAN, ((self.car_controller.frame // 2) + 1) % 0x10, self.cruise_button))
+
+    return can_sends
+
+  def create_mock_button_messages(self, CS: car.CarState, CC: car.CarControl) -> list[SendCan]:
+    can_sends = []
+    if self.CP.carFingerprint in CANFD_CAR:
+      can_sends.extend(self.create_canfd_mock_button_messages(CS, CC))
+    else:
+      can_sends.extend(self.create_can_mock_button_messages(CS, CC))
+
+    return can_sends