I checked that ours had been changed at service and "hard" is an understatement for putting it back together, I had to loosen the trim panel to get it the cover back in.
I think it is made by Bosch so any good auto factors should be able to get one for you.
Ian
2002 1.4 Petrol SE, silver with climate control for SWMBO, Honda Accord Tourer 2.2 iCDTi for me.