cannot recall what size hole is in the dash (nor can force myself to go and unlock the spares shed anf hunt for a spare dash panel, if it's an 8mm hole then consider these. http://www.ebay.co.uk/itm/10-X-STANDARD ... _957wt_701
Just for other peoples' information, the ones that I bought are fractionally too small. I could have used a bit of insulating tape to reduce the size of the hole and so the captive nuts would be sufficiently firm in the hole for them to work.
I eventually found some which are a perfect fit from www.carspares.co.uk, their part number VANFIX72. They have an Ebay store: