No no no no no no and NO!!!
Call WCB they have instructions ...then buy about 3 or four 4" cut-off wheels, a grinding wheel, a pair of 60 &120 grit flap wheels and remove the old mounts. You spent the money for the arms don't just donkey-Dick install them. The shock mounts are arguably in the wrong position but that's another topic. BTW, yes I have installed the WCB arms.
Matt