  We study the $p\bar p$ production and decay of exotic quarks that are
predicted by the SU(3)$\times$U(1) extension of the Standard Model. We show
that recent experimental searches for SUSY particles at the Tevatron limit the
mass of these quarks to be above 250 GeV. Run II will extend the reach to 320
GeV. This is one example of SUSY search signatures that apply directly to
another, quite different, new physics model.
