Can something simple be done to simply raise the rear an inch or two without replacing struts, shocks, or springs?

Any type of shims or something?

Ummm..its not that hard of a DIY. If its the money then not sure. But if you do something to lift it, then it is probably permanent and you won't get the comfort out of the suspension because of the stiff lift of some shimes or lock rods,bars of some sort to lift it.

I have been told, that the GP typically sags in the rear.....If you measure front to back there can be as much as a 1.5 inch difference...
I replaced my struts with KYB...still noticed a sag...then after replacing the rims with a different offset combined with a wider tire, I experianced wheel rub....
Soooooo I swapped out the rear springs with a set off an Oldsmobile Intrigue...(they are a progressive spring and seem to hold the back u0p.
Now the car sits level....I had it lowered but could never adjust to the harsh ride....and the whell rub has been solved

Intrigue springs? You remember how much you paid for them? I understand goin to a junk yard and all, but gettin a good idea