@grimreaper
I got mine from RRAGES.COM and they offer magpul and a brand that has no name and sells for $14 for a pair (these are the ones I have). they cover 18 rail slots and are a hard rubber with scalloped tops. I tried them on the side rails and the scalloped tops gave a real nice grip feeling, they are light, and seem to cover the rail edges and top very well for protection against rail damage.

you can get a good look at them in my photos above, looking at the second photo from the top.