Looks like just about everyone is out of stock. Only piece of advice I can offer is I had ordered a couple rail sets for a RM23212 and then everyone went out of stock and the item was discontinued. What I found out is "King Slide" which is who makes a lot of their rails changed the part number and basically the same damn rail got released under a new number. My guess would be the same thing holds true for your rail.
It wouldn't shock my if your chassis fits the same rail as mine since they are both 2U and made by Chenbro. It would stand to reason the mounting holes are probably in the exact same spot.
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