Matt they are the same runners on both the front and the rear runners.
I have, after seeing this post, and had one runner fail - changed all mine to the $4 jobbies - some months ago. and they are great.
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Not wishing to put water on your fire,
but has anyone actually put those rollers on a front track, ( a fix with photos)
the how to fix was for the rear one,
unless i am a complete knuckle, ( you don;'t have to agree) I couldn't get it to work on the front one, the bolt that attaches the roller, sticks out too much, even after grinding it back it jams in the scissor lift,
ladas did you take photos, if yours was a front repair, and the dimensions of the roller when you made it fit.
john