Just replaced the one on my c-max about a month ago! The bigger 150amp one was cheaper than the lesser power one,but was still £145 plus vat!

Was a wee bit tight to get in about hands with it,you need to remove the top air hose,and the bracket that holds the cat to the engine block so you can get to a couple of the bolts.Its not the worst in the world,but it is a bit time consuming.