Is there a list for factory spring codes??

Im not sure if you guys are sure of what I am talking about so Ill try to explain...
Basically, depending on the package that came w/ the jeep the suspension coils and leaves were assigned certain codes....not only part numbers but also codes...

Some had LT, GK, JJ ...etc...

Does someone have a list where all of those may be??
Thanks

I have no idea what's what, but here's the list that relates letters to part #s from the pages out of my 87-90 parts manual. (Obviously this is a hacked job of merging two pages, but the info is all there ;-)
Jeep on!
--Pete

Yep, thats what I was looking for except, now I have to figure out what they mean...

Anyone?