Who makes Focus Central Pistons?!!

They look like JE, but that's not really saying much as most photos of JEs I've seen say "exact product not pictured".

You're probably aware that JE can produce one off's, I don't suppose you know if they need all the dimensions or if you can say "Identical to the Focus ones xxxxxx but xx:1 comp ratio"?

Obviously compressed gasket thickness would make a slight but important difference too (another thing I need to find out!)

They aren't JE. I've asked before, but don't remember the exact name of the company that makes them. Call them and ask.

weren't they ross or something that starts with a R.

Nope....they are Probe

I thought FC made everything in-house.

Nope....they are Probe

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Yeah, that's what they are.