do you advocate stock arm geometry, or adjustable / open? if the after market arms must be identical to the stock piece in temrs of critical dimensions, than this is a no brainer - do it. if locations of bushings or the distance between them were to be opened, this would need more vetting.

FWIW the EJ/K/M rear arms are stamped and pretty light by comparison to the DC2/EG cast ones, but they bend if you look at them wrong.