Where to get heatsink with flat bottom?

Whoever said that never got a batch of the perfect heat sinks for B+ and screen regulators for $1.95 each. They are going to show up everywhere till the box of them is gone.

The proper place to get heat sinks is the surplus market. You take what you find - if it’s black it’s black. 😀

The mosfets are mounted to the back. Full pack TO-220’s with the leads heat shrinked.
 

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