I have RO 150 and ETS 150 sanders, both 10 years old or so. Original 9 hole paper. Can I convert to multi-jetstream 2 by simply buying paper and new sanding pads?
Welcome to the forum. That is what I did. But do note that the old paper will line up with the new pattern so that it is at least usable. Just won't have as many holes as the new pattern.
It is all backwards compatible. Note that the newer paper has little to no noticeable improvement, so don't throw your old stuff away but use it until you're out.