I don’t know of a polished one. Flowkooler ha a cast aluminum, hi flow, you would have to polish it yourself. I have polished an oem aluminum timing and it came out pretty good

. It was cast
Flowkooler high flow pump 1641 for the Ford L6 has a CNC machined billet impeller designed with an increased vane count and a tighter impeller clearance. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade...
flowkoolerwaterpumps.com
I haven’t come across a shiny thermostat housing