Josh, I am toying (that usually converts quickly to planning) with adding slide bars on both sides and an extra table on the right to my virtually unused 1000 base model. I can remove this hardware from another 1000 which I will sell. I like having that extra table, even if it is only used to hold a cocktail glass.....
My machine is a 1999 model, and came with a clip support.
FWIW, when I pulled the caster supports out on mine to put drain holes in them, I did see some dry rust flakes in one leg. So, even though it was garage kept for its prior life, somehow moisture got in and stayed there. The inserts now have holes, and their installation was accompanied by a liberal spray of rust preventative....