I was looking at yoke's on E Bay and I see ones that look just like what I need but have different part numbers. So is there that much off a difference or is it just to keep the series straight with different numbers? I seen a yoke with 7047843YP and a yoke with 7047887Y which is series 6. But they both look the same to me. I got a snapper # 7047843YP ordered.