Mounting to the fence requires 2 x M6 or ¼” T-bolts by 12mm long (½”) and 2 x thin square nuts.
If you can’t find short enough T-Bolts then you can cut them to length. Alternatively if the square nuts are large enough to act as the T-bolt you can use them in the slot and then use pan head bolts that are 12mm (½”) long, much easier to find. If you are using the variable mounts then you will need to double the bolts and nuts.
T-Bolts
UK M6 T-bolts: https://amzn.to/3Q0i1Oj
USA ¼” T-Bolts: https://amzn.to/4gwk4nL
Nuts
UK M6 nuts: https://amzn.to/4jJIP2U
USA ¼” nut: https://amzn.to/4aItFXy
Alternative: Pan Head bolts - m6 (1/4”) - 12mm (½”) long
UK Pan head bolts: https://amzn.to/4hBJyln
USA Pan head bolts: https://amzn.to/4hs6djN
Magnets 8mm x 2mm
UK: https://amzn.to/3Q4ywsI
USA: https://amzn.to/4hlP3En