Skipperb wrote:
2002 liberty stock was 235/75/16 Factory wheels

The backspacing of the stock liberty wheels is 5.5"
The stock size is actually 235/70R16, not 235/75R16.
With any 15" wheels, it's not the backspacing that's the issue so much as the interior diameter. The KJ has large brake calipers that fit fine in some 15" wheels and don't fit in others. I don't know of any 15" stock jeep wheels that will fit on a KJ except the moab wheels of the wrangler rubicon. Other 15" wheels fit (Crager is a known fit, for example). You may be able to fit a jeep 15" wheel if you use a wheel spacer, but even that is an unknown.
I say your best bet is a test-fit. If the rim fits, go for it!
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Jeff 2005 Jeep Liberty Renegade
4x4, 6spd, Leather, Sunroof, trak-loc, skids/rails, hitch+shackle, hooks, Alpine/iPod, Thule, GPS, CB, Frankenlifted w/ 31" MTRs
Photos Cardomain