Good morning everyone,

I am looking to add some alum. T-slots to my CNC machine's table along the edges to help me hold down some stock.
I have a few options ranging from offerings from 80/20 extrusion (which are not ideal since they have a bit of camber along the "flat sides") or mitusmi and Minitec to woodpeckers alum pro rails.

With all these different offerings and in order to make a good decision I would like to ask the community if there is a standard size more clamps and work-holding hardware comes in? Are there more 1/4" fastener types? 5/8? , M6 M8?
This information would allow me to make an educated assessment of what I want to do.

Thank you in advance.