Hello, have been searching for a while and i can't find any mods for Aprilia SR50. That's because they don't exist. Its a very popular scooter and they are used in racing/stunt competitions and also for daily drive. *i Drive a 2016 one.
I have some things that might help! Here they are:
Full 3D Model of the Aprilia:
Link1: https://www.turbosquid.com/3d-models/2016-aprilia-sr-50-model-1353743
Aprilia SR50 rear wheel:
Link1: http://www.3dcontentcentral.com/Download-Model.aspx?catalogid=171&id=199096
Link2: https://www.3dcadbrowser.com/3d-model/wheel-rear-aprilia-sr50
Random:
Link1: https://www.stlfinder.com/3dmodels/aprilia-sr-50