Thinking I had an easy solution to the missing outer slide, I ordered a $40 pair of new heavy-duty rack slides from eBay. Beautiful pieces and ball-bearing slides, decent quality hardware too. Only had to drill a couple of holes in them so they'd match the drive chassis, mounted everything up, and then discovered that they were 1/4" too narrow, no matter how I arranged the brackets, and the drive wouldn't slide between the rack rails. Crap! So I bought two 24" pieces of 2 x 2 x 1/8" angle iron at the local steel place for a whopping $1.40, drilled four holes in each, sanded off the scale/surface rust, bolted them to the rack and slid the drive right in. You can't even see the "homemade" part unless you're really looking, too. Should've done that to start with. If I ever need to service the drive, I'll just slide it back out and set it on the bench... http://s1181.photobucket.com/user/DrCharlesMorris/media/PDP-8/P09-29-15_19.… http://s1181.photobucket.com/user/DrCharlesMorris/media/PDP-8/P09-29-15_19.… However, if anyone should stumble over a set of stock RX sliding rails I'd be interested for the sake of originality ;) Jay, let me know exactly what measurements you would need. There's a pretty good view of the inside rail on the second pic. thanks Charles