Hi Blue,
So sorry, I haven't got the answer. If stuck can I suggest a cheap thread gauge and micrometer, nothing too special. Surprising how many times they are useful.
I realised early on my sump is a proprietary item. When servicing my car after dispensing with dealer servicing I then realised the plug, too, was special. A quick check with the gauge and a few measurements allowed me to have one made....just in case.
It will allow you to get a correct item
