My bad, should have read back further
1330's are the same width as the 1350's. Although they are not as big in diameter on the shafts, the width adds a lot more strength due to the leverage. A 1410 again has no bigger diameter on the shafts than a 1350 but is much stronger just due to it's wider crosses. Rubicon come with 1330's at the rear. That being said, my front double-cardan is still a 1310 with a 1410 at the axle.