According to the parts book there should be two sleeves on the car, one on each side. So the question is which side of the upper control arm should the sleeve be mounted??
The sleeve (1857 840) was available for installation at the rear of each arm for severe-duty applications -- police, taxi, etc. There's a TSB on it, but I can't find it at the moment. The sleeve could also be used to take up the slop if the bushing wouldn't fit tightly; that may be why the FPC shows "2" instead of "AR" (as required); perhaps it was assumed that by the time bushings would need replacement, sleeves would be warranted.
I can't imagine any harm that might come by installing all four sleeves, if they'll all four fit, on general principle.