This is a magnetic rollbar for the WPL C24. Please see the video link for installation and detailing.
Magnet for the rollbar slots
Slot is 4.25mm in Diameter by 1.5mm tall
We used: mcmaster.com/5862K402
Thickness 1.0mm / 0.04"
OD 4mm / 0.157"
The magnet under the body should be large.
1/4"(6.25mm-ish) Diameter byt 1/8"(3mm-ish)
We used: mcmaster.com/5862K103
Installation video:
https://youtu.be/ONJw4A8U4ak