Replacement rails for 17FP KMM

I won a 17FP KMM (P/N PDJCN) via an auction and when I got it, I found that the seller didn't have the rails for it. It was listed as-is and made no mention of having or not having rails so I had assumed that it would have come with them. I have been pulling what's left of my hair out trying to find replacement rails, first trying to determine what the part numbers are for the rails themselves and only finding the RapidRails PNs (apparently the left rail is GY570, the right rail is HT929, and both together is NM220?), then searching around and finding that there are no listings on eBay for these currently, and any online parts store that has them listed for what feels like a reasonable price is out of stock.

I'm getting a feeling that the only true recourse is to keep checking and hope that maybe one day someone will have parted out their 17FP and listed the rails for sale, but I figure it can't hurt to ask: Does Dell sell these parts still? And if not, can anyone suggest any sort of equivalent or maybe even a DIY hack that might work to get this thing mounted in my home lab rack?