  We discuss the Higgs boson mass sum rules in the Minimal Supersymmetric
Standard Model in order to estimate the upper limits on the masses of stop
quarks as well as the lower bounds on the masses of the scalar Higgs boson
states. The investigation of the bounds on the scale of quark-lepton
compositeness derived from the CDF Collaboration (Fermilab Tevatron) data and
applied to new extra gauge bosons is taken into account. These extra gauge
bosons are considered in the framework of the extended $SU(2)_{h}\times
SU(2)_{l}$ interaction model.
