Pump head change questions...

[olly_p]

Hi, im from the uk and i have a peugeot with a bosch pump with a 9mm head. Im looking to up it to 11mm and to do it myself.
What parts do i need to change? and pictures of what they are. I have read loads of threads on here and what a great site for diesels!
Any help and advice would be much appreciated.

Thanks Olly