The filler and drain plugs are both on near side of car engine, the drain plug is 3/8" female square, at a pinch you can use 3/8" drive socket set wrench which will fit directly into it.
Seem to remember fill plug is 17mm a/f male hexagon.
Make sure you can get to and slacken the fill plug before you take out drain plug, as you may drain the box and have no way to refill it if our cannot get fill plug out.
Space is limited and I had to use a funnel and plastic tube to get oil back into gearbox, the good news is that when oil is at correct level it will start to overflow out of filling hole. Make sure car is on the level when refilling.
Have attached a PDF of picture from Haynes manual showing drain and fill plugs.
capacity is 1.5 litres, workshop bloke at local Honda said normal fully synth engine oil is OK to use, but I prefer the proper stuff and a few years ago I used Castrol SMS-X but its been replaced by Castrol Syntrans Multivehicle 75W-90 now I think. No point in putting cheap oil in as only a small amount needed and it will last 70K, I used molyslip gearbox additive in mine as well and when I traded it in with 120,000 miles on the clock the gearbox was still not making the dreaded whining noise in lower gears. It also made the already slick Jazz gearbox action even slicker.
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