I should add that the Felder/Hammer safety bars come with the hardware to mount them to thier aluminum fence as well as hardware to add them to a wood fence as I have done.
I've seen a picture of an SCM version of these bars somewhere before, just don't remember where.
I don't have a SCM/Minimax retailer anywhere near me that I know of, but there is a Felder dealer about an hour away so that was the easy way for me.

I end up doing lots of one off stuff in my shop and find this quicker and easier than making breakthrough inserts for short runs.