I have wishbone that has a 28-29 style forged yolk but the part number does not agree with any listed in the Green Book. Cast number in one recess of the yolk on one side of the web is A3409C (definitely ends in 9C) and there is also a cast number in the yolk recess on the other side of the web PFC235. A3405 is what I expected to find. Is this a late 29 piece or aftermarket item? Would appreciate any info you may have. Thanks Tim