milgard vinal patio slider roller and track replacement

I'm afraid there's no way to sure at this point. The only way to confirm a match is to remove your roller from the door and compare its physical attributes to those available for replacement. One roller some Milgard doors used was our 81-030, but there's no guarantee it's what you have. As for the track, what is the issue with what you have currently? The reason I ask is, if you only have some dents and divots, you could possibly just install a track cover over it to get it working like new again. See our 80-102.