K12 Gear linkage sounding clonky

My wife's '03 K12 with 99K on the clock has a very clonky sounding gear linkage. I've oiled/greased all that moves where it goes into the gearbox, but it sounds more like it's clonky below the gear lever. It's been like it since we bought the car 5 years ago with 90K on the clock. It hasn't got worse and changing gear is easy, but the clonky-ness is finally making me want to do something (cheap) about it. Reminds me of an old US army jeep I drove many years ago.........
Any advice would be welcome.
 
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