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Not sure what the exact difference is, but beware that Pelican has a ton of "file photos" on their parts pages. I thought i had gotten the wrong clutch slave cylinder because of it.
On the subject of the track arm i watched the video from EPS about theirs with the urethane bushing. I like some EPS stuff but not that. If you watch him push the thing around you see the arm bending quite a bit. That track arm isn't designed to bend and with a ball in the end it never will. Look up "pin connected structures" in any statics book. Each member is statically determinant (just means a mortal can do the math on all pieces of the free body diagram) because they can only push or pull, exactly the job of a track arm. Counting on that flimsy forging to stiffen the ride is a suckers bet in the long run. I bet some of those will snap off a few inches from that end. That would be "interesting"
I have to agree with Brad Roberts on this one. I'm hoping he will explain the 987 arm better
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