I was browsing for stuff and fell upon a site that had a tee slot style linear bearing with extrusions to match. These bearings, have side adjustments and were top mountable. They also had all the common shapes and sizes. I thought, some of you thinking of using this type of linear bearing would be interested. I'm no expert, but I think the side to side movements has been addressed. It's called Faztek. Check this out.
Thanks for the infro.
I may give these a try.