I decided to make a video of how to change all these consumables on a Vespa GTS 300, if someone decides to do it himself, what are the steps.
The most interesting thing was that the oil sump gasket had oiled at its upper end, and the variator belt had not rubbed there.
All filters, oil, candle and gasket are purchased from the official Vespa dealer. I was pleasantly surprised that the air filter is pre-oiled unlike aftermarket filters.
It took me about an hour or so to change everyone.
I think for a true Vespa fan this would be a nice time on the bike.
I hope the video helps you, and that my efforts to capture and process it have not been in vain.
If you have any questions I would be happy to answer.