Gearbox oil change

I spoke to the dealer last night and asked if they kept the gearbox filler plugs in, they didn't but the parts guy seemed to think they had changed them to a steel part now? Anyone had one?
 
I think the filler plug is plastic, shouldn't be a need to replace it, just important to check you can get it out before you drain the oil!

You get the drain plug washer with the 2 litres of oil I linked to, and it's just an 8mm bit (same as the engine sump plug) to undo it.
 
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