Hello potato!
Welcome to the forum!
I bought longer mirrors from this seller many years ago moto-science.com
They required an adapter to match the mm size of mirrors to scooter mount.
You can try contacting him at hb7777@gmail.com with your fitment questions.
Frankly....I found it to be very frustrating finding mirrors with a longer stem.
As for your current floppy mirrors...slide the rubber cover up at the base of the mirror stem. Tighten the nut. Do not get crazy.... you do not want to snap off the mount!
Or, you can remove the mirrors, clean the threads with a stiff brush, and apply drops of blue threadlock (Loctite) and remount.
Mirrors can be difficult. Some screw on reverse, some normal right-tighty. Some are 10mm, some 8mm. Adapters are avail. on ebay for both situations.
Maybe your dealer could walk you through it?
Then there are mirror "extenders"(extensions) aplenty on ebay...to raise and push stock mirrors out further.
Stig