I measured my stoppers:
Inner part: 35,8 x 10,8 mm
Outer part: 43,4 x 18,5 mm
I added the very simple Fusion360 file if you need to change the measurements.
Printed in BambuLab TPU 95A scaled up to 103% to have a nice and tight fit.
Supports enabled for the 90° overhang
This was my first time printing TPU with supports and they came off super easily (barely an inconvenience)
The author marked this model as their own original creation.