I was just wondering if anyone has bought this P&C set from FAT and have an opinion. FAT says the cylinders are not AA, but from their "own supplier".

https://fatperformance-rimco.com/collection...on-cylinder-set

Also, is it better to buy the KB pistons and cylinders from the same supplier (e.g. FAT or EWM) than from 2 separate suppliers?

Since FAT and Rimco are now the same ownership the cylinder may be bored stock.

KB pistons it doesn't matter who you get them from EMW still gets a cut, as they are the originators/suppliers and have an exclusive contract with KB to produce them. EMW also has the same exclusive rights to the T4 JE pistons.
The KB T4 pistons are a modified pin Ford Pinto piston.

I bought my 96mm p+c from FAT/RIMCO. Everything went together nicely but have not yet installed or run the engine yet. Hopeful to be able to report back with startup results soon.

Great info Mark makes sense ,IMO its a well priced option for good parts, I still can't decide on what I read about the AA kits ,earlier they had piston ring gap issues and some said the rings weren't that good,so I find it interesting to see some sell still with US made rings and pistons .

I used AA 96mm Biral (aluminum fins with steel barrel) and KB pistons with Hastings rings.