1992 olds custom cruiser 4l60

previous owners spliced bottom transmission line on the radiator was a small rubber piece its leaking I got one from a 92 Caprice with same motor and transmission will it fit on my wagon I got it from sedan

I cannot say for certain, but the Caprice 5 litre and the Olds CC 5 litre shared the same radiator, so I would think it probably will.

If not, you can make a reliable repair using rubber line designed for fuel injection systems and fuel injection hose clamps. They differ from regular gear-type hose clamps in that they close in on the line evenly instead of pinching it. If possible, use a flaring tool to start a bubble flare on the 3/8" steel line to provide a positive bulge so the rubber cannot slide easily. If not, then use two hose clamps on each end for greater security.

The only difference possible is an oil cooler. Rad cooler on one side, oil on the other. If your car has an oil cooler rad, and the new rad doesn't, you're out of luck.