  This paper is the completion of an earlier work arXiv:1207.4867 which
involves the derivation of oblique corrections in the MSSM at one loop. In
terms of the two-component spinor formalism, which is new in compared with
those used in the literature, the contributions arising from the fermion
superpartners i.e, neutralino-chargino sector to self-energy of standard model
electroweak gauge bosons are calculated. Corresponding descendants the $S$, $T$
and $U$ parameters are presented. The validity of our results is examined in
two ways, which are then followed by detailed analysis on the results in the
literature.
