Am pretty sure SMC used to list them at £40 something but not sure for which engine. Worth giving Les a call 01277 890931. It's amazing what he can dig up !I have spoken to XPart this morning, and they have them in stock, but only for vehicles that are categorised as 'VOR' or 'Vehicle Off The Road', due to the low stock levels at the moment.
Any XPart dealer will be able to order it for you, but you must make sure that 'VOR' is quoted by the Xpart dealer.
Hope this helps.