Noooo! Calibra pistons are for use with Mondeo rods. If you use them with a Focus rod (ie, Eagle), the rod+piston length will be wrong, if memory serves, they will be too long and the piston will be poking out of the block by about 5mm!

If you do decide to try Calibra pistons and Eagle rods, make sure you measure them etc before commiting to buy, but I am sure they are wrong! Use a Focus type piston and then machine to suit the desired CR.

Calibra pistons and a mondeo rod will give about 7.4:1 IIRC with a 16v head.