I got Ricks OME rear springs from his '91 explorer back when his X was black. to give you an idea how long ago he bought those, they are marked as OME-36 which is a p/n scheme they haven't used in 5+ years.
We still have the main spring and a few other leaves from that pack on our X now. There are 200k miles on the OME spring leaves. We have of course added/replaced leaves over the years and now its a franken pack. F-150, Stock Explorer and OME leaves intertwined. I "think" 2 leaves (including the main) are still OME.
Anywhoo.. The OME leaves are great for flex but they are not very good for towing and are closer to 2" of lift than 2.5".
What I Like about them is they are strong. As in, we haven't cracked them and I know they go inverted when wheeling.
truckhaven-rti-2011-1 by
maniak_az, on Flickr
After looking at the pic above, I "think" 4 of the leaves in the pack are still OME. Also, we threw away (cut and used somewhere else) the overload as the OME overload hung down.
I almost forgot.. The OME rear springs work on all the 1st and 2nd Gen explorers (solid rear axle).. They are actually listed for the 2nd gens but they work on the first too.
~Mark