Bearings wihout flanges

[exit104]

I have a set of 2 Nippon Bearing linear slide rails with SW12G open slide bushings and a WA 12, fully supported base. The bearings are just sleeves, they have no flanges, just a couple of slots for retaining rings.

I expected to be able to get housings for the bearings that would allow me to connect them to the gantry. Alas, I cannot find housings without bearings already in them.

So, what is the proper way to connect these bearings to a gantry? Do I need to create a custom fixture or am not looking in the right places for the housing?

Thanks!