Rack rails - standards?

I've been working on getting things cleaned up in the basement - and part of that involves putting these devices I have into racks. Unfortunately, the devices and the racks rarely find me at the same time, and as such, I wind up with devices with rails bolted to the side of them, and racks with no rails. But, since rails consist of two parts, the rails on the devices are useless, since I don't have the mating rails. I want to rack up a Cipher drive, and my newly accquired Fujitsu Eagle, and I also have a shelf meant for two CDC sabre drives, that will work to hold another CDC drive I have (non sabre, the older one, 9" platters), it should hold the weight. But, none of the rails I have match up, and the CDC shelf uses a special bracket. I have a couple modern PC clone and Sun servers with full railsets, and I tried borrowing rails from them, but of course the holes don't line up with the holes in the devices. And the Dell rails might have worked if they were meant to mount to a standard rack - I have no idea what this square clip/hole thing is supposed to mate with. So, basically, is there a standard for these things at all? Any hole spacing or rail size standard, or did every manufacurere just make their own? On the two Cipher drives I have, the same model, have totally different rails. So that would suggest that there was at least a device bolt hole standard at one point. But, I am sure this is going to be another case of how wonderful standards are - there are so many to choose from... Is there some designation I should look for when hunting rack rails on eBay? The modern rails don't seem to line up with the device holes at all - are there differnt classes or rails for different weights, or am I just lookig too far into this? -Ian