  The existence of a strongly interacting sector responsible for the
electroweak symmetry breaking is assumed. As a consequence vector and
axial-vector bound states may be formed. These resonances mix with the Standard
Model gauge bosons and are of primary phenomenological importance for the LEP
physics. The extended BESS model is an effective scheme based on the symmetry
group $SU(8)_L\otimes SU(8)_R$, describing in a consistent way the interactions
among the pseudo-Goldstone bosons, vector and axial-vector resonances and the
standard gauge bosons. In a previous paper, the contribution from extended BESS
to the electroweak oblique corrections was evaluated. However, only an estimate
of the effects coming from mass and wave function renormalization of the new
resonances, was given. Here we complete the evaluation by computing explicitly
these effects. We confirm the previous result, that is, in spite of the great
precision of the present LEP measurements, the extended BESS parameter space is
not very much constrained.
