Looking for 4032

[Inspector]

I did find a supplier on Alibaba that has a minimum order of 20 kilos (44 lb) plus whatever the shipping would be. It's bigger in diameter than what you need but you could ask if they have smaller diameters and even sell a smaller amount. Can't hurt to ask. You could probably sell on the excess to others in the same boat as you and get your money back......eventually.
https://www.alibaba.com/trade/search?fs ... &viewtype=

Pete

[armscor 1]

A lot of piston manufacturers use Hyper Eutectic pistons.
A hypereutectic piston is an internal combustion engine piston cast using a hypereutectic alloy–that is, a metallic alloy which has a composition beyond the eutectic point. Hypereutectic pistons are made of an aluminum alloy which has much more silicon present than is soluble in aluminum at the operating temperature.