the ones bkr6e are recomended for BAleno. and M13a is the same engine in liana nd Jimny.
so if liana also uses the same plugs as Baleno, then ik-20 iridiums are the best for the 1 coils per 2 cylinder system (or waste spark system). but they cost u around Rs. 4300 a set
Denso k20pr-u11 (i tried to find em but i couldnt) u can find ngk bkr6e easlily in the market.
Denso k20r-11 (are Toyota corolla plugs).
for reffernce about the 1 coil for 2 plugs system.
further more. from denso's website.
DENSO SPARK PLUGS