Suzuki Club UK

The forum is showing two different values for differential fluid capacities. The reproduction of the workshop manual shows front 1.5 litres rear 1.3
The listing for fuel,oils,fluid capacity and grades shows front 2.0 rear 1.5. Which is the correct amount?

Fill it till it starts to dribble out of the fill hole. Thats the right amount.

I know that,it's just that I looked at the copy of the workshop manual and bought three litres which should leave a drop over. If I go by the chart I need to buy another litre and I can think of better things I can waste €12 on
And looking at the workshop manual the drain and fill plugs have different part numbers,are they different sizes and threads?

Presuming drain plugs are magnetic?

Also depends what model. Some have a standard looking hex bolt drain plug. Others have a flush fit drain plug with a square 3/8 (ish) female head.

I noticed a drip of oil from my gearbox a few weeks ago so thought it was a good idea to top it up but the filler plug is too difficult to access from underneath on the street so did it from the gearstick. Imagine my surprise when I drained it that there was at least 2 litres possibly more as a lot ended up on the deck. Read that overfilling causes frothing which can damage it. Had the clutch changed by a local garage nearly two years ago and the gear change is still working fine so must just be lucky.