Hi John. Thanks for prompt response. Don't have pic 'cos part missing - must have ditched it with the old filter. Mine is an early 3 brg petrol, but the parts manual says they all use the same filter type RTC 3184. So I guess your plate should do. It's a metal disc with a dished centre and central hole for the securing spindle, it lives inside the oil filter housing below the filter element. I'm in W Stirlingshire. Cheers, Nij.