I need a track and hardware fir a "Monarch" sliding doors set.

Hi, Patrick. That number doesn't tell me anything about what tracks or hardware your door uses. Do you have any of the old parts available for us to see? If you don't, then I don't think it will be possible for us to help. We absolutely need the old parts to use as a reference.

If that's your situation then I would recommend contacting the company from whom you bought the door to see what they recommend.

That's perfect, thank you! I recommend our 23-028 mirror closet door roller. I think you'll find that this is a great match for your original.

As for the track, the 23-028 has a concave wheel, which means it can work with tracks like the 23-272. We have other lengths under different product codes, as well, all of which you can see on this page. 

Great, that'd be the 23-270.

As for the top, I can't say for sure. I'd need to see what hardware was used there. Your bottom rollers and track are generic and they don't work with one specific top guide. There are potentially dozens of possible matches.