Unless you have them magged , checked for straightness , polish the beams , shot peened , re-size and new ( good ) bolts , stock rods are marginal pieces.
And if you do the math , aftermarket rods will come in around 200.00 a set cheaper.
Never used to be that way ............ only because there never was the amount of aftermarket parts available.
This is one of the few examples of where the good old days weren't all that good.