This is a late‑production oil cooler for the 1/48 Ki‑84 Hayate. This type of cooler began appearing on aircraft from approximately serial number 2000 onward, although production did not fully transition and earlier‑style units continued to be installed on some airframes. The same late‑type cooler was also fitted to the captured Ki‑84 tested in the United States as T2‑302. This set replaces the kit parts B3, B5, and L23 with a more accurate late‑type cooler housing and intake shape. The cooler is composed of two parts that must be assembled with cyanoacrylate or a similar adhesive. It is intended for modelers depicting late‑production aircraft or the T2‑302 evaluation airframe. The part is designed as a direct replacement and can be installed with minimal or no modification depending on the kit. The component was test‑printed to verify general fit, but small adjustments may still be necessary depending on printer differences and kit tolerances.