That's the one.

It has plastic flaps on the sides that do the same thing as a featherboard
so there's no need to modify it. It also has a plastic L shaped piece (not shown)
that acts like an overhead featherboard.

The magnet is strong. To release it you have to grab the handle and twist it
to the side. I wouldn't use it alone for cutting strips but it works great for
side pressure.

I'd expect most woodworking stores carry them. Got mine at WoodWorker's
Warehouse.

Rob