This is dummy model a 40mm aluminium heatsink. Use for whatever you would like, for your modeling purposes

Link to heatsink.
https://www.amazon.com/WWZMDiB-Heatsink-Aluminum-TEC1-12706-Thermoelectric/dp/B0B53HSYQN?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A1YZW40LYQY3L1