R380 sump plug

my 90 has a R380, out a disco I think. I purchased new filler and sump plug as I'm away to change fluids and wanted new ones.

Purchased FRC6145, but the plug is too big. The one that came out is similar style to that in axles, but has a 3/4 drive.

So are there two types of R380 sump plugs?

Any thoughts?

Sure youve not removed the fill plug?

I've removed both.... fill plug is standard and standard size.

I had a look again at the parts book, the LT77 and R380 seem to have the same sump plug, so I don't understand why this one doesn't fit!

late 380s have a plug like below with 3/8ths drive

That’s the one!! Know a part number for that!
Any idea what car the R380 would be off to have that? It’s a G reg 90 with a 300tdi conversion