You would need to have/or machine the blocks that are on the machine now (the part with the switches on it) or make a new one.
Looks like theres enough material to machine pockets out for the new bearings?

The plate behind (the plate below the 2 guide rails are hovering above) would also need precision drilled and tapped to fasten the new supported guide rails to it.

Would also point out that you will need to have the rails in the right length to match your machine.