Diff identification

Can someone help me identify my diff from a hybrid please.
I believe it's from a classic range rover.
On the casting it has the filler plug with the number FRC1948CA
The crown has 45 teeth and the pinion has 13 teeth.
For every turn on the pinion the crown turns 3.5 times.
It's all imperial.
On the crown and the pinion the numbers 5682 are printed on them.
I need to buy a 2nd hand one but need to get the correct one so can someone please help.
Maybe you have one for sale?

Ok,

I've found that the ratio is 1:3.5

So does anyone know if there's a difference between an imperial and a metric diff? Are they interchangeable?

Mines imperial.

both fit the same and yours is 3.54 diff and crown wheel should have 46 teeth, so any 10 spline 3.54 diff will do,

So will a discovery 200tdi diff with the same ratio fit?

Thanks for you reply.