Sounds right, have you checked the Equivalent Parts thread? Apparently a few people say don't bother with the cheap pattern ones, go for Bosch, twice the price but they last, High52Kojak reckons the Bosch part no is something like DE 661 431 80.
Thanks for the replies, didnt know there were any others avaiable apart from the Citroen ones think ill try the Bosch type this time. Hope to see yous at Chatsworth next month ill be in a silver Cerb reg no L14HTN